It was pretty obvious in the Spring game who was more elusive/slippery/quick, especially in tight spaces. Not that Vad is bad at this, it's just the Thomas is better.
I was there and when Justin played with the #2's he looked very elusive and against the #1's not so much. I also watched Vad break for great yards against the 1's. I watched a similar result at the scrimmages as well, but I will admit that in the scrimmages JT didn't play with the #1's much. So I'm gonna wait and see before making the proclamation of superior elusiveness. He appears to be shifty and nibble and you can't deny his speed, but I'm tabling these absolutes concerning both QB's until live bullets start flying.