Robin Thicke is the only person mentioned that comes across as having any type of real "Soul" in their music...
This is very true, Timberlakes music doesn't sound as 'natural' as Thickes. Thicke falls in the line of Teena Marie, Jon B etc white artists who actually had authentic soul, Timberlake is in the other direction, dude was pop artsist till he figured out he needed to become more 'trendy' to have a long solo career.