Not sure I agree there, ename144.
How do you know "Tommy just isn't this vindictive, driven antagonist"?
Every indication so far is that he is. He's a petty, morally bankrupt, self-centered jerk. I see nothing to indicate he's a secretly friendly beneath the attitude with a short attention span (not sure where you got his attention deficit from...please clarify). Certainly none but negative traits you are ascribing to him have been displayed or hinted at anywhere in the story's clear depiction of the character as Doc has written into the story.
The ending of Episode 5, along with other scenes earlier, suggests the possibility that Tommy might be a problem, not only for the MC, but the DIKs. While it is certainly possible that he will, as Rusty indicated, "come around," there is nothing from the narrative to suggest he will.
As we get closer to the end of the story...lets assume that Episode 6 is the kick off for the climax of the story (Doc did say 6 will be much longer than any other episode to date). If that's the case, then the "conflict" for the "protagonist" has to escalate for storytelling purposes. From a storytelling standpoint, adding Tommy to the MC's problems seems quite likely given that Doc has taken pains to paint the guy as an antagonist so far, as bad or worse than Quinn. Particularly since the main conflict for the character (Hell Week) is now over. That conflict is resolved. An offended Tommy, pissed at the upstart newbie MC trying to take his place, is a reasonable and likely replacement for the Hell Week conflict.
Tommy has never been in any way an ally of the MC. I expect him to be a problem. If not, that would be a missed storytelling opportunity.