I'm on another rewatch and I havent really seen mentioned anywhere that Greg was faking incriminating conversations with Tom on his phone (and although his Tom impression wasn't great, knowing Greg he'll do something to affect the audio) as well as clearly having his phone recording while they were burning the papers.

Those conversations could prove to be Greg's ace in the hole in some way and possibly lead to him betraying Tom, becoming a fully corrupted Roy. Also seems like the sort of thing that was forgettable enough to catch us off guard when its brought up again.

TL;DR Greg's recorded faked incriminating convos with Tom in that scene could lead to him sending Tom to jail, fully corrupting our favorite tall baby boi Roy