I am the biggest fan for Cotts as 5th starter, but Wright hasn't pitched that terribly. He gave up 3 earned runs his last start and I will take that from him anyday. Give him a couple more starts and see how he progresses. If he's not looking good, then you make the move.
And why isn't trading for Kip Wells an option? I am going to watch him pitch tonight against the Cubs so I can see how good and mature he's looking now at the mound. I'll be switching back and worth at times.