To touch on this...
I'm not attacking any guild.
Whatever is going on between you and T or EG and Seven I don't personally care about.
The reason I got involved is the simple fact of guilds in normal acting like they are super cool kids when they are in normal mode or if you want to be all technical about it "scouts" for Hard modes or where it actually matters.
See normal is for anyone to do but only the hard modes will separate the talented from the non.
If you also really want to debate things the smartest thing to do (if 10's are really easier) would be knock out the 10 man version so you could open up heroics and do the 25's.
At least, that's what I would do if I were still pushing for top end progression.
If gear is the next excuse or concern then I'd say make that two 10 mans or even 3.