act alone? epstein was not serving in a role as his only client. if the clients are nobodies, then why are they not jailed?

Because he didn't have clients? If that's the case, and he was just engaging in his own terrible appetites, then it would (of course) explain that fact completely. I'm not aware of any of his victims publicly claiming that they were molested by other men as minors (though there are several that said they had sexual encounters at his 'events' with other men when they were above the age of 18). Other than Giuffre, who identified former Prince Andrew.

When identifying other people they believe are complicit in Epstein's crimes, it has generally been to claim that there were lots of Epstein associates that were involved in trafficking girls to him, such as at this press conference:

BBC: Epstein accusers say they are compiling list of his associates

...but I'm not aware of any of the victims saying that there were men other than Epstein committing sexual assault against minors - again, excepting Giuffre's experiences with Andrew. As one of the victims' lawyers put it:

"Jeffrey Epstein was the pimp and the john. He was his own No. 1 client," Edwards told ABC News. "Nearly all of the exploitation and abuse of all of the women was intended to benefit only Jeffrey Epstein and Jeffrey Epstein's sexual desires."

Edwards describes the enigmatic Epstein as living, essentially, two separate lives: one in which he was sexually abusing women and girls "on a daily basis," and another in which he associated with politicians, royalty, and titans of business, academia, and science.

"For the most part, those two worlds did not overlap. And where they overlapped, in the instances they overlapped, it seems to be a very small percentage," Edwards said. "There were occasions where a select few of these men engaged in sexual acts with a select few of the girls that Jeffrey Epstein was exploiting or abusing -- primarily girls who were over the age of 18."

abcnews.go.com - Jeffrey epstein key victims attorney

There may simply not be any "clients." Epstein may not have been running a "service" for anyone other than himself, at least not with the girls who were under the age of 18.

Are you aware of any claims by victims that they had sex as minors with people other than Epstein? I wasn't able to find any - but it's also very difficult to search for things related to a topic that's making headlines today, since the results are just filled with the day's events.

why would trump, famous for reneging when not threatened, provide leniency to proven pedophile maxwell?

Because she traded her statement that he wasn't involved with anything in order to get the leniency? Costs him nothing to give that to her (he's not one that cares about the principles of letting that horrible woman have an easier time in jail), and he was hoping that would solve a political problem for him and get his base to back down on the issue. She had something of value to trade - that statement. Doesn't mean she had anything else.