Here's a different angle. I think I get what you're saying.
Roger: is already in good position so he wants to advance position safely by bringing Buchecha in and inching towards the back or get a sweep. Like a patient vet. If he tries to jump to the back (requires opening his guard), this could create a scramble (something Buchecha is known for being one of the best at).
Buchecha: senses Roger is trying to pull him so he tries two things. He tries to free his left sleeve by using his right hand and pinning down Roger's right hand. He's hoping that will create space and keep Roger from advancing to the back. Once he frees his left arm, he tries to step out of guard but loses his balance. He tries to turtle and roll but Buchecha underestimates Roger's ability to stay glued to him and Roger winds up on top while Buchecha has to settle for an upside down closed guard, which is easily opened by Roger.
I think that's what you are saying, right? Lol