IMO, MG's account of the encounter with two men on Tuesday is both innocent and irrelevant. Let's look at the simple explanation:
BM, being "beside himself", sends the two to give MG her money owed and one of them makes the comment about hush money in a light-hearted manner. A dry joke that falls flat.
As far as the phone comment, maybe MG asks them about her rights regarding relinquishing her cellphone to LE. And the person she asks responds with his opinion of her legal rights.
They successfully complete their errand by paying her. I just don't see two guys roaming the streets of Salida like Mafia henchmen.
You raise an excellent point -- we should never assume that any "story" we learn of, is the COMPLETE story.
Speculation: BM's friends find MG to give her her pay. They presumably chat about the drama of their friend BM's wife being missing and maybe the chat includes how LE seems interested in BM's alibi and general doings.
MG mentions that LE has asked to see her phone. Maybe asks their opinion as you suggest. Friend attempts humor by saying "we wouldn't want this moolah here to look like hush money, now, would we?" in his best New Jersey imitation.
Only a small, contextless bit of that exchange makes it into public knowledge by this point.
I also want to add an opinion/observation of my own. When someone in a small town is suspected of something, especially before there is obvious proof, there will be a tendency for the community to protect that person as if the community itself has been accused.
So if this dynamic is at all in play here, MG might be pressured to not reveal anything negative about BM, even if they have no idea whether he's actually guilty or innocent of this crime. It becomes a "stand with the community" kind of thing. IMO
For me, the bigger question is why did he have to do a mechanical thing at almost midnight if he didn’t plan on taking the bobcat?
IMO we do not have knowledge that he took the Bobcat to Broomfield, nor do we have knowledge that he did the mechanical thing at midnight. The machinery at the Salida search site has not been shown to include the same Bobcat we see at his home in the flyover video. (which Salida equipment may or may not also belong to/be rented by BM, or not. We simply don't know.)
He might have changed the oil of the Bobcat at home on Friday, told them he did it at X time on Saturday, and then got called on it when LE pointed out that at X time Saturday he had claimed to be somewhere else. Could be completely innocent confusion on his part.
Do I believe this is the truth of how it played out? No, I don't believe it. But as for what we KNOW or have proof of, it could just as easily be. It definitely requires an IMO until we know more.