So 4.38-9 is legit - and he does have change-of-pace, breakaway speed, the other gear Steve talks about. It's evident on the plays I've seen him run, but I haven't seen much from Tutu that looks like more than one speed. And he's easier to bring down.
Tutu knows more of the playbook and can fit in "right now" where needed and Stafford knows how to throw to him. How much of the playbook X knows and can execute from the year of experience he has under his belt, plus whatever chemistry he might have with Stafford, are unknowns (at least to me) at this point.
Did anybody go to the Charger game? What did you see from X, live?