Datsik has retard strenght and is unpredictable, so in a MMA fight I could see him catching Aleksander Emelianenko the way he caught Andrei Arlovski.
Maybe in kickboxing/Muay Thai too
But pro-boxing?? Aleks used to have great, fast hands for a HW, with a stance that even Baby Fedor would emulate. Aleks has good boxing for a MMA HW, and Datsik is just a brawler with good kicks, he's going to get used as a punching bag for calling the younger Emelianenko a prison rooster all those years ago.
Ok, but that was obviously a fluke though, with HWs there's always a chance that a huge swing will touch, 9 times out of 10 Aleks wins via pure technique...
I they had an immediate rematch right after Aleks was OK again, let's say at the ring in the local boxing club, just the 2 of them, no distractions, Datsik would get whopped
.......Speaking of: can't wait for Arlovski vs Werdum, this is going to be such an exciting battle of Sambo vs BJJ at HW, and of course of UFC vs PRIDE!!!
Plus Fabricio just joined the Chute Boxe academy, you can bet his stand-up is going to look much better; and with AA's excellent boxing skills, this fight is a guaranteed barn-burner on the ground and on the feet.
Werdum might be a ground wizard, but AA is no slouch either... his achilles-lock on the Maine-iac Tim Sylvia was just a couple years ago (that 3rd fight of them was so damn boring, at least I can take confort in knowing that there won't be a AA/Sylvia 4, never, not in 6 years, never.)

(sorry 56kfags, get gud)
Plus, in his last fight Arlovski KO'd another ADCC wiz in
Pe De Pano,
Still...
I'm picking Werdum for the win, AA has more experience but the Brazilian has been swimming with the PRIDE sharks while Arlovski was taking it easy in the UFC.
And PRIDE will always be better than the UFC.
Our children in 15 years will still agree on that will browsing futur-Sherdog directly into their brains while flying on their hoverboards