Honestly, I have no idea... Gylfi seems to have more pace about him, but that's about all I can think of. But it seems like he's not broken in with the squad yet, and trying to accomplish that opening the season in Newcastle is not the time, especially when you've got a ref that will set up a wealth of set pieces, being as good as Van der Vaart is on that front.
Playing a formation that demands creativity (4-2-3-1) and just chucking it didn't help, either. I'd say switching back to a 4-4-2 and just letting Bale, Defoe and Lennon run, but dos Santos is literally the only other striker on the whole roster. The yids may be screwed if they don't pick up the tab for Adebayor.