I don't know if perkins warrants any serious contention.
But I am more curious on the dwight howard case - how much different is he than Ben Wallace or Dikembe mutombo? He has more height than the former and more bulk than the later.
But without those natural gifts (Bulk / Height), can we say he is a better offensive player than either one of the above. Lets face it (like wallace and dikembe), he is know mark price at the stripe. I think he faces a somewhat similar career progression - unless he develops some offensive game. I don't believe he has better offensie skills, yet can score more points by being more of the focal on offense AND benefiting from height and bulk advantages. Plus good defensive players can stop him.
Defensively Mutombo has avergae more blocks and rebounds per games than Howard...as has Big Ben.
I think that howard is the shiny new toy, who may be a slighty better offensive and slightly worse defensive version of mutombo / wallace. He may continue to progress in his career - but can we expext that? What if we were to cherry pick the best 4 years of mutombos and wallaces careers to compare to howard (for all we know he is on a downward path or will get hurt).
I just don't see the love. In no way is he top tear. I don't know if he is even definitively in the top half of the second tier.