Cacee has a combos, Steph's chars(one of em at least) has a saber for combos, and I'm recalling at least one more character with combat. The combat X has is mostly the equivalent to just a normal homing attack but instead of only targeting enemies it also attacks enemies, can reflect projectiles, and hit certain obesities(the trailer has it brake spikes) I'd personally call it a stretch to call it full on combat compared to other characters with combat.
Sonic X as a show was inconsistent but majority of the Time Sonic was only able to do spinball with rings in the show, in the episode you reference the spinball he does isn't even the usual kind the show uses. Ring burst is the version of a charged spin dash, this one is more or less how sonic 1 did spin ball, only able to be done while in motion already as all sonic does here is let gravity carry him down.
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