Interesting decision for sure. I suppose it's about player types and roles more than quality. That's the 30 man squad by the way, little to no chance that Di Santo will go I would think.
That Argentina side looks better defensively than I actually imagined. Zabaleta, Demichelis, Garay and Otamendi. All somewhere between good and very good. No idea who their left back will be though.
If media reports are true, they have been reporting that the argentinian staff have no liked tevez's attitude in the past few months, hence he has been cut. also, his form for the national side hasnt been great. and perhaps wouldnt have been in the starting 11. although he would most probably have been in the 23.
demichelis has only just made it back into the squad following his recent form for his club side. theres a chance he may not make the 23 however.