Ultimately, I think Westwood would thrive in a team that keeps possession. His ability to keep the ball moving would be more useful if we weren't constantly trying to punt it up the field. Better distribution from our defenders would be key. Baker or Clark both struggle to pass it back to to him unless he's demonstrably unmarked. It leads to passages where he doesn't get to influence the game when our defenders get panicky.
Notice, Baker will 9/10 try to pass it to the left back, even if it puts the LB under pressure and the LB has few options. The game passes by Westwood imo, not from his own voluntary disappearing act, but from others inability to think ahead in possession.
I think in a 3 man midfield or a 2 man midfield without Delph and a strong DM, he would thrive. I don't think he's a pencil in for every game, but he's a good option.
And as much as Delph gets noticed, there are crucial moments where he misses a pass or picks the wrong option in attack. I feel Westwood would be more involved in the attack if he wasn't deployed as THE defensive midfielder. Whatever he says, that's not his best position.
If only Delph and Westwood could be combined into one player.