Prudential's doctor said I wasn't disabled when several others said I was. Can they reuse this doctor to terminate me months later?

I have a policy with Prudential, and this is the second time I’ve gotten a denial since first filing and getting approved. They first denied me during STD, got a lawyer, appealed, and won (after they took the maximum amount of time to decide, of course.) It’s been about a year since then, and they’ve terminated LTD leave (right after I got my initial denial for SSDI). I have a question about their medical experts that I can’t find info on anywhere. Prudential used a doctor when they terminated during STD who said I wasn’t disabled. Months later, and an IME where one of the two paid-for docs said I was disabled, I’m approved. They used that same doctor to terminate me this time. Are they legally allowed to do that? It would seem to me that if a doc said I wasn’t disabled but others later found I was/Prudential reinstated benefits, he’d be a poor choice for future reviews. If this ends up dragging out to the lawsuit stage, I’m sure that’d be a mark against them, but I’m wondering if there’s any ERISA protection from that or something in case law where that was held against a disability insurer.