With a lot of melee gear, the warrior will do very well.
Not sure how much constitutes "a lot".
For a lot of raid content (in various expansions), the DPS warrior has been top or near the top on DPS.
Had one in Tier 5/6, which was always behind the warlocks, but ahead of everyone else.
Have one, who through Naxx25/Ulduar25 was top, every raid he played - but guild kind of fell apart, so not sure if that would have continued in ToC/ICC25's.
If you stick with the warrior, it should really improve; not sure another toon wouldn't be easier though.

A few questions...
The Druid is going cat and not bear to DPS, correct?
Are either the druid or rogue attempting to be behind the mob?
What are they using, as far as abilities?