With all due respect, you do look a little foolish. Not because you have a concern about Collins at RT, but because you keep "moving the goalposts".
First, it was "Mack isn't a DE - he's a LBer". When that point was countered , your reasoning became "Mack wasn't giving his best effort".
What's next?
The Raiders are a 3-4 base team that plays variations of coverage schemes. Does anybody actually think Mack is a DE in a 3-4 system? Marcus Spears and Igor Olshanksky play defensive end in 3-4 alignments, not guys like Mack or Von Miller. On 3rd-and-long, they put their hand down wide in a 4-man rush, yes. But Mack drops into coverage and plays OLB much of the time. That is not a defensive end.
And superstar veterans go out and bang around a little bit during the preseason, but they are largely just trying to avoid what happened to Edelman, Ware, Meredith, and Hitchens. The preseason needs to be re-thought.
My position isn't that Collins is terrible at right tackle. He's just average at best. He's above average at left guard, which is where I wish they'd leave him. I'd rather have four above average linemen and a weakness at right tackle than three above average linemen and two questions at guard and tackle. Dak is sturdy enough and it's not on his blind side.