Yes, when all is said and done, I believe the Dells should be regarded as the greatest RnB/Soul male vocal group of all time, even ahead of the Temptations.
That estimation is based on all possible criteria such as: quality and diversity of the group's recorded work, number of hits, influence, longevity etc etc
My all time top ten of RnB/Soul vocal groups goes something like this:
1 Dells
2 Temptations
3 Drifters
4 Impressions
5 Four Tops
6 Isley Brothers
7 Coasters
8 O'Jays
9 Spinners
10 Manhattans
Honourable mentions to the Dramatics, Blue Notes, Whispers, Platters, Intruders, Delfonics, Chi Lites.