By Andrew Gould The Dallas Cowboys thought they were bringing back Randy Gregory. ESPN’s Adam Schefter reported a done deal for five years and $70 million Tuesday morning, but the defensive lineman signed the same contract with the Denver Broncos instead. During some Twitter interactions, Gregory shed some light on his feelings toward his former franchise and the fanbase. On Sunday, the pass-rusher posted that everyone’s “opinions don’t pay my bills.” When a fan argued that Gregory was just avoiding accountability for his about-face, the 29-year-old blamed Jerry Jones and Cowboys ownership for…