I think after Dez left the NYG game and early on in the PHI game, TWill may have been trying to hard to do well.
The drops are not like him, and he looked just a bit off. I think he may have put some undue pressure on himself to almost be Dez. TWill works when he's being TWill. Romo has said that TWill is great after the catch and we saw it in that PHI game, especially on the TD run with that long stride that left Maxwell in the dust.
Hopefully from here on out he just keeps being TWill and keeps doing things the TWill way and doesn't worry too much about trying to be a hero or trying to fit into somebody else's shoes