Just to compare Westwood and Gana defensively:
Gana is averaging 5 tackles, 3 interceptions per game.
Westwood is on 1.7 and 0.7
Offensively:
Westwood has 1 assist, Gana 0.
Passing is virtually the same in terms of completion but obviously Westwood is looking to create more chances.
Gana's definitely pulling his weight in terms of what his job is in the team, you might argue that Westwood hasn't quite done enough to escape criticism. I've kind of come to the conclusion that Westwood's biggest issue is that he isn't influential enough - he has patches of it and sometimes games where he makes his mark but most of the time he isn't. Definitely something to work on but a hard thing to develop/improve.