Looking at this, it reminds me of how if you looked at the Mavericks roster before the playoffs started and asked people if they thought they could beat the Heat, or even reach the Finals.
The teams share a lot of similarities. For my money, I think Batum could do as good a job as anyone of defending LeBron. Then, T Young is behind him ready to bring more length, hops, and strength. Fouls won't be a problem. Not in the frontcourt either, and I think 20 minutes of Camby, spaced out is as good as 20 minutes of Chandler in the same span.
Millsap isn't better than Bosh, and Matthews isn't better than Wade, and there are fairly huge discrepancies between the two sets of players. Billups is an upgrade over Bibby and CHandler is an upgrade over Anthony though, and I think the discrepancies between the 2 sets of players is pretty large there too, although none of them approach the level of dominance that Wade does.
If there was a team that was made strictly to stop LeBron, this one is it.
This one is a really hard one. Very close. Closer than I would've thought until I started to think about it.