he didnt blow his spot how you trying to make it seem....i'll give you the 'he was playing you' line...although he didnt say it in a 'yall some damn fools, he was fukking yall over' kinda way, i'll give you that....
as for the 'no one can change that much', it does the opposite of blowing up his spot...it plays further into the lie of not talking to rust in 10 years...him acting surprised/shocked about the drinking when the cops saw rust drinking, would really make the cops think he hasnt seen rust in 10 years...again, the only person that has mentioned they havent talked and had a falling out is marty...so it's not like he and rust have had to put on a grand performance for the last 10 years to convince people they stopped fukking with each other...
to continue: for all we know, rust drinking in the interview might be part of the ploy, cause we saw how he acted and drugs he did while undercover when he got ginger...so drinking a lil bit aint shyt to that man...and like you said: he knows protocol, so him getting caught in photos couldve been on purpose to get brought in to see what the new cops know...him and marty couldve set this whole thing up cause maybe they are close to figuring out the leader of the cult, so they applying pressure to see what happens...cause again, they make a hell of a team....and so far, we're only seeing this from their prespectives, so they can lead us anywhere they want...