[@mattmanganon] As I said previously, A major personality change to a structured villain causing them to behave out of character. Additionally, the indepth explaination doesn't alter the facts that the other Corps would be aware of Martin and the others Sinestro used; Likely as soon as Mongul knew, at the very least they would know the moment the White Lantern was summoned.

Of course your explanation added an additional issue. You imply that in his anger he attacked Sinestro.  Yet he was given a yellow ring later, but not the red ring then? That doesn't seem to fit. Enough rage to attack someone you essentially gave everything to because they took what you gave them? Thats obviously enough to merit the red ring. Of course that would require the all powerful villain to care about his minions and not vaporize them to eliminate threats....