Yeah it wasn't a "definitive loss"... The fight was very close. Ppl likely see that fight differently, as they were used to Pereira dominating and those ppl don't even know Ankalaev tbh. Like Ankalaev isn't just another random fighter, he is one of the best ever hence why he has been undefeated for 7 years all while being active... He's from Dagestan, trained Sambo since little, has huge kickboxing skills on top of it, hence he rare are the fights he goes for TDs, only if he really feels challenged, like vs Jan and Alex, and once he goes for the "I need to TD", he'd always get a TD except vs Alex...
He isn't known that well because he isn't from the same team as Islam and Khabib. But skills wise? He's an Islam Makhachev but weighing LHWS weight. Do you want to imagine hypotheticals of "ohh what if Islam had those skills but were a LHW, how would he do?" ... That's Ankalaev right there. And like Islam, he has only one defeat. However, Islam got TKO'd when defeated. Ankalaev dominated 99% of the fight he was defeated and in a weird way he got in a triangle choke and tapped in less than 10 seconds... Which was weird as either he didn't know there was only 10 seconds remaining or he tongue was accidentally trapped in his teeth so he had to tap lol. But outside of that, he's basically undefeated. Has the skills of an undefeated fighter, in the UFC he's like 17-0, something like that... It's the same skills of a what if Islam Makhachev at LHW or a Topuria at LHW (obviously the speed isn't the same but if Islam and Topuria were bigger they'd also not have the same speed as it's impossible but anyways)...
The main problem is that ppl don't take him as that high standard. Imagine if Topuria had 3 title defenses at 155 and lost to Islam Makhachev in a close fight, a 48-47 that was a really close fight, with Islam winning deservedly but by slightly outperforming Topuria? Like a 52/48 type of fight... No one would think "Topuria has been fraud checked"... They'd love a rematch. But Ankalaev isn't seen like that when he is a heavy candidate for a #1 top fighter right now. He and Pereira would be like Topuria vs Makhachev in terms of hype and skills because Alex Pereira is a monster and one of the best and Ankalaev was seen more like ah hmmm Charles Oliveira than an Islam Makhachev... He vs Pereira is THE fight for the #1 pfp pretty much but Ankalaev has a limited reach because he doesn't do media stuff with DC like Islam does. Islam had those viral "who give him black belt? We need to verify this... Charles has lot 7 times already, how can he be champion??" moments... Islam is funny on camera and grew on ppl. Ankalaev is as skilled but he doesn't care if he doesn't speak English and he wasn't even interested that much it seems in the division until Alex moved up. Before, he'd destroy everyone and basically say "how many more wins until the belt?"... He wouldn't call anyone out...
... When Alex Pereira moved up, beat Jan, then Hill, then Jiri, THEN he started to speak in interviews in Russian and on X more. When Pereira and Khalil would fight he was red hot, he was even saying "Khalil is one of the most dangerous fighters ever, I would like to fight him or Alex Pereira. They put him vs Khalil, I hope he doesn't lose this fight because I want to fight Alex, but Khalil Rountree is one of the most dangerous fighters..." ... Then when Alex beat Khalil, he started to grow on and on and he saw the real value of Alex. So much so when asked if he'd rather fight Alex Pereira or go to HW and fight JJ, he said "both are equally challenging, but right now Pereira, I see at this stage him as the most challenging fight. I think it's more like when Jon Jones was younger and light heavyweight, that's how I see the Pereira"... And 1 month after he fought Pereira, he got a screen shot of Tom, Jiri, Jan and said "All those boys are there having fan in London. When I watch them fight, I know Pereira is on a different level from them"...
... He has always been the best fighter with the same ability as JJ when younger... He's the DC/Gus/Smith/Santos LHW JJ... Jiri Prochazka and Khalil, like Tom Aspinall... Pereira, like Illia Topuria. But ppl never saw Ankalaev as what he is, a stone cold killer just like stone cold Alex Pereira. Ankalaev isn't there to be fun or short reaction YouTube videos to get closer to fans, or to post memes, much like Alex Pereira (who's kinda forced into it because his videos with Nina are pushed for views exploring both market abilities), though they're both stone cold killers, assassins, who are like two guys who have completed / cleared a game and don't have anyone other than themselves. If JJ retired, Tom is like a Johnny Walker or an Anthony Smith or perhaps a Khalil... Both tho are the bosses tho Ankalaev was never seen as the final boss as well as Alex as the final boss. They probably can beat anyone right now other than them going to trilogy, or a 5th fight.... Which is why I partially want Alex vs Tom before, to hype this rematch that is the Topuria vs Islam except ppl don't see it that way cuz Ankalaev other than tweeting funny stuff, is only training heavily like a maniac, he trains and only that, much like Pereira, he's gone form media rn mostly because he is a natural gifted fighter that was blessed and is dialed in training as heavily as he can (in fact, it's said that both are competing even on who can train harder without any rest)...