If that's what he's using then the cab is part of the problem. Per this Invalid Link Removed that 410 has the same output as a 210xst.
That being said I can keep up with a moderately loud drummer and a guitarist with a 210xst, with a wt550 @ 8 ohms/275 watts....so....maybe it's the head AND the cab....
You're quoting from a thread that has only opinions, there are no official specs anywhere to be found in that link you referenced on the ex410sc4.