Are you sure we saw the same fight? It was a complete grappling match. He probably still believed he could do it from the back like he did against lesser fighters. He needs to get a better TDD because you never want to be on your back especially if it's top grappler.
This fight had much less to do about grappling than one might assume. The real issue is that tony has shown terrible distance control and footwork to avoid being against the cage or having Dariush underneath him attempting to grapple in the first place.
Yes, Tony has shown shaky TDD, yes he’s struggling to get back to his feet. But the real issue is that when you take away the flash, he has nothing to keep his opponents from disrespecting his striking and coming right down the center for clinches and takedowns.
In the past his relentless forward pressure could make up for this, but his hesitation has completely halted his ability to win fights. His TDD has always been exploitable, but he created so much chaos to force bad shots, make opponents second guess themselves, and put them on the back foot to have success.
Tony has nothing in his skill set to put anyone on the back foot, especially now that he’s less willing to march forward and throw caution to the wind. It's not just the grappling, if Dariush wanted to stand and bang, Ferguson would've been highly susceptible to the strait left and would've been battered.
Giving your hips to your opponent, turning away from your opponent, hands down, freely giving up octagon control, continuing to throw one strike then squaring up afterwards to be hit. This is basic stuff that he got away with for a long long time. The takedowns and ground control are just a product of this flagrant lack of basic initial defense. Every fight starts standing, and these basic fundamentals help avoid these compromising grappling positions that tony continuously finds himself in. There's no amount of grappling practice or TDD that is going to save you if your slipping on the canvas, turning your back, can't keep anyone away from you, putting your back to the fence, losing your balance, etc. If Charles mounts you with minutes to work, your basically toast. The point is avoiding the situation entirely, the best that your able.
Hope you understand what I was trying to get across, there are a myriad of ways to deny grapplers easy transitions, if you just use utilize the basic fundamentals.