Stipe is considered the greatest HW of all time by many still. 2 wins over DC. It's a matchup fans used to talk about since way back when they were both champs.
So it's a homage to an old fantasy match.
Plus, Stipe is a known commodity. Not necessarily a marketable fighter, but he's known amongst the general audience. There's a bigger storyline and everything needed to sell the fight.
Tom would be a cool fight for the hardcore fans, but we aren't who keep the lights on.
Jones would probably take a huge pay cut to fight him, which defeats the entire purpose of moving to HW to begin with.
Even beyond Jones, there's a whole team of talking heads representing Dana, the UFC and WME who definitely wouldn't want him to fight Aspinall either. Especially if he only has one or two left.
Jones is one of the UFC's only stars left. There's definitely a huge push to make his last fight or two as big as they can possibly be.
Sucks for Tom but that's the game and he isn't that guy.