Wengers no rotation unless you've got a broken leg
That's certainly not what I've witnessed from him this season, Arshavin got benched for no apparent reason in a game earlier this season Birmingham, Sagna has occasionally been overlooked in favour of Eboue, Diaby doesn't always start (e.g. game at the weekend), Rosicky is in and out of the team (16 starts and 13 sub apps this season) etc. Eduardo is probably a good case in point actually, by your own admission he isn't playing games in a row, just being thrown in for games here and there, i.e. rotated.
Anyway going back to the sharpness, the problem is that plenty of other players come back from long term injuries and deliver the goods, he keeps picking up niggling injures (as one might expect) and really looks a totally different player now. Patience is a commodity top clubs can't afford when we are talking Champions League quarterfinals, most players get their sharpness back through playing reserve fixtures, a sub appearance or two and then a couple of games in the first team.
I'm not saying I want shot of him but at this stage of the season we can't afford to be carrying any passengers, irrespective of what the reason is. For me the team should be something like:
...................Almunia
Sagna...Campbell*...Vermaelen...Clichy
......Eboue.....Denilson.....Diaby
......Rosicky*...Bendtner...Nasri
Fabianksi
Silvestre*
Eastmond
Walcott*
Eduardo
Vela
Merida
*Rosicky is rated 50:50 for tonights game, so I'd swap for Walcott if he's not fit. Likewise Campbell will only start if fit according to Wenger so Silvestre on standby.
As you can see from the bench we're a bit short on numbers in terms of holding midfielders, Denilson has never really convinced me in that role, and it's never been what Diaby is about (in spite of the tiresome comparisons with Vieira).