Thank you, catcher, for your thoughtful post.
Manchester City are the team in form, and likely to be this season's Champions. Chelsea were last season's Champions, but are now sadly out of form. Ivanovic has been suffering more than most. I would have preferred to see a forward - a winger, even! - put Ivanovic under pressure, both to create scoring chances and to pin him back.
The Tactical Deconstruction of the Executioners Bong agrees with you about Besic and Naismith;
"The unfortunate Besic's cameo ended in woe - as it did 12 months ago against the same opponent - this time pulling up with a hamstring injury after a collision with Zouma. Martinez opted for the only snide for snide replacement open to him, with Naismith joining the action down the left flank, and it was down this channel that a lot of the damage was done."
With three defensive midfielders, we may well have contained Chelsea. But without Naismith's golden touch, we would probably have found it much harder to achieve the victory. Let's see how respectfully Roberto approaches Swansea.