What are you talking about? Magny has 70% TDD which is highly respectable and the three fights before this was taken down ONCE and took all his opponents down several times.
Meanwhile Maia has a shitty 30% take down percentage. Much worse than even Magny actually even.
And in his last three fights before this he's gone 9/39 on takedowns lol he's been horrible. It sounds like you need to go back and watch some fight pass douche bag, I judge fighters on their most recent fights and for the past couple years the stats back up Magny has had good wrestling and Maia has had shittier wrestling.
Before I go any further, have you watched Magny's fights more than once? And Maia's? I recommend you do so if you haven't and what I say here will make more sense.
Magny's TDD is bad. 70% TDD sounds fantastic until you think about how they actually decide to tabulate takedown attempts, which can be quite subjective, and who the hell said fighter is facing to rack up that percentage. For future reference, stats without context are often meaningless in MMA. Magny has fought a grand total of one competent submission grappler during his streak, da Lima, and he was taken down, mounted and almost finished with a triangle in that one. Every single fighter that wanted to take him down since Moraes pwned him, from Baczyinski to Kunimoto, has taken down Magny when they chose to pursue the takedown, most multiple times. Magny's TDD is clearly subpar and nowhere near good enough to hang with elite grapplers in the WW division.
Maia's takedowns are awesome. As the guy above me already mentioned, Maia has a tendency to spam takedown attempts in an attempt to bring the fight to the mat by any means necessary, because once he gets you down and gets on top of you that's generally it for the round or fight, depending on the level of grappling his opponent has. You're trying to say that a guy who grapplefucked Fitch, cleanly took down DHK (weird ending, but it counts), took down and dominated Story, Yakovlev, and LaFlare, and gave Rory hell on the mat in their fight has bad takedowns? You absolutely need to stop looking at stats and go actually check these fights out to see how wrong you are. His stats look poor because in the third (or fifth) round he has a tendency to fade and just kill the clock on poor takedowns and flopping to his back in order to waste time and ice the fight, but if you actually look at the credentials of the people he is taking down cleanly and not letting up, you can obviously see that he is one of the best offensive wrestlers in the division, especially early.
Which is why when you combine Magny's poor TDD with Maia's excellent takedowns you see Magny getting planted on his posterior effortlessly and from there it's just a matter of time.
That is all.