Assuming Jaylon can play, I'd rather blitz him than Watt. IMO, he'd be better than TJ. Let Lee play coverage. Speaking of coverage, Jaylon is 100 times better dropping back than Watt.
Truth is, no LB is going to blitz a lot here in Marinelli's 43, period. Watt would have been wasted at OLB here and he would have been a mis-fit for that spot in Dallas. Also, Watt is too small to be effective at DE in this system too.
That is why everyone and their brother says Watt didn't fit here. He's a 34 OLB at the most.
Finally, a blitz takes the offense by surprise... it is more of a scheme sack than anything else when it happens. You don't have to spend a first round pick on a 43 OLB that is going to blitz. 34? Sure, those are edge rushers. Not in a 43 though.
Charlton was a much, much better pick than Watt for this defense. For Pitt... Watt is much better.