Not at all we moved Nolan and Carroll on at the right time. Barton is a difficult one because he didn't make it easy.
This thing where people "well look he keeps getting relegated" is nothing short of moronic. Good players get relegated and play in poor sides! Either through playing with **** players or being poorly managed. Gary Cahill is alright. Joe Cole got relegated before he joined Chelsea, he was decent there. Defoe, Carrick, Glen Johnson, Di Canio. James Milner got relegated. Shane Long got relegated. Kanu got relegated. Pierre Van Hooiidonk. Juninho. Erik Lamela got relegated. Antonio Cassano got relegated. It has happened right throughout the years as far back as year dot football wise.
So while I wouldn't go buying all my players from relegated sides. The problem wasn't selling those players, it was not replacing them with another band of solid pros who were committed to the club (whether from home or abroad, but more likely home)
You have a hard on for not having domestic players, and seem to think they are all cloggers. Yet only one side in PL winning history has not had a solid core of home based players - even then Arsenal had a few key components. Ah the 5th place season, yeah we did have a solid core of steady pros though didn't we? I could have sworn Simpson, Krul, Raylor, Williamson, Saylor, Perch, Best, Guthrie all played fairly significant roles that season

Those solid pros eh, absolute nightmares.
Its simply about knowing when you've bled them dry and then moving them on, and replacing them with another band. Or better still, have bought a band of talented young domestic talent and developed ready to take over.
I think I've just holes in your argument the size of Obis arse.