"The thing about Bill is that he played in the same offense that Donovan played in," Frazier said. "So, he has an advantage over some coordinators in that regard. He can tailor things to Donovan, based on his history in a similar offense. So, it's a good situation for us."
The verbiage is slightly different in each version of the West Coast offense. 'Trips Right HB Counter Motion Drag Slant' could be a base call for different teams, but though the play concept is basically the same, how it's dressed up in one system or another can be completely different. Even for a veteran like McNabb, it can take time to get the hang of everything.

"Well, one thing I tried to get comfortable with was Bill's terminology the way he prepares for each game, how the practices are going," McNabb said. "
McNabb has a brighter outlook with offense, mentorship in hand

Article is loaded with littel nuggets like that.