I'd say it's likely Jumbo Drill. He's shown that to be his signature fusion before (most blatantly in Season 3 when it's the monster he uses to strengthen the alt-dimension portal). I'm also not convinced we'll get access to more than 1 Expressroid (or Truckroid, sadly), making Stealth Union less likely.
He uses Stealth Union more often, so it will probably be that. But it's a lot weaker than Jumbo Drill... Both deserve an animation tho, really cool artworks.
^ oh btw I forgot Stealth Union's effect, which can equip opponents monsters once per turn, and can equip more than one! This is also great, can be used to clear opponents monster zone and spell trap zones if it is used with Storm. But still, needs 4 specific monsters...
I was mistaken about which monster he used for the alt-dimension portal (he did use Stealth Union), but still. He Summoned it in duels a grand total of twice, so arguing he used it more is somewhat pointless, if technically true. He Summoned Steam Gyroid twice, too. And Cyberdark Dragon. Drillroid's probably the closest thing he has to a signature monster in all honesty, lol.
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