Actually, I'm in agreement with you (in theory..)...I think this combo would be "the perfect world scenario" for this team as well...(if Collins were progressing and playing up to his obvious physical potential)...I'm just basing my statements on the fact that Collins really seems to be in a funk right now...and regressing rather than progressing...
If DC could start to show that he is 'getting it' as far as understanding where he needs to be offensively and defensively, I would love to see him and Salley on the floor together in some matchups...
I'm starting to believe the lack you (and I initially) see in DC and MS together is more of a coaching than playing ability issue. If the coaches put DC and the other bigs in situations / schemes that enhanced their strengths and minimized their weaknesses, they'd seem to play much better.
Too often (even inb past years) we get "killed" by teams playing seemingly slow/un-athletic or not extremely talented bigs that got put in the correct position to suceed.