Holmes is indeed at top ten with Ali.
However, I feel the reason the general boxing public fails to fully acknowledge his achievements is because he just couldn't achieve the popularity that the likes of Ali, Louis and Marciano did. In their era's each guy transcended boxing and reached the fans on a personal level. Although he was a nice guy Larry lacked the charisma that Ali had, the (racially motivated) pride in Louis or the All American love Marciano enjoyed.
But similarly to another post I made today (on PBF) Homes deserves to be remembered for his talent in the ring, his skills and abilities and his fighting courage rather than his personality and life outside the ring.

The sport is Boxing, let's remeber the Boxing he did.