The ones who were megastars in WWE before going to TNA, Sting.
And he should be, TNA treats him well for the most part. And he's been in TNA his entire pro career.Samoa Joe I reckon could do well. Even Stone Cold said himself he would hire Joe and make him a star in WWE. And its not like WWE doesn't want him, they've tried but Joe is happy in TNA.
I heard he wanted to go to the WWE last time he was available but they wasn't interested. This was back when TNA was jobbing Joe out constantly and he didn't seem as motivated.Samoa Joe I reckon could do well. Even Stone Cold said himself he would hire Joe and make him a star in WWE. And its not like WWE doesn't want him, they've tried but Joe is happy in TNA.