You realize that Jesus', Paul's, and John the Dipper's followers were all apocalypticists. In fact, the majority of Jews with the exception of elites were. Mark saying that he was an apocalypticist and not mentioning him as a follower of Jesus is not evidence for him being a follower—you have to use the two gospels that smack the most of fantasy to make that claim
Matthew copied passages word-for-word from Mark—there's no debate about it in among scholars. The classic example of verbatim agreement is the 31 words in Mt. 10:21-22 and Mk. 13:12-13, which can only be explained by copying a written source. Word order often doesn't matter in Koine, and Mark uses simplified grammar and vocabulary (referred to by some scholars as "trade manual Greek") that Matt and Luke stylized. Have you ever seen students' plagarized papers?
> If they moved the body, and then the disciples started preaching resurrection
Why would officials expect it to? If the body went missing from the cross, would that cause resurrection claims? Do you have a source for any contemporary resurrection claims caused by missing bodies?
If Joseph decided that he wanted the body out of his tomb for whatever reason, would the "threat" of resurrection claims pressure him to keep it there?
> I don't think any naturalistic case is probable. The resurrection is clearly portrayed as supernatural and there is nothing natural or naturalistic possible.
Great, I'm not sure why we're having this conversation then if you can't argue without presuppositions. The only other hypothesis that commenters have made is the mainstream one: the body was left to rot and then dumped in a grave for criminals. Do you think this is more likely than reburial?