Where Goku seems to be avoiding going Super Saiyan (since he said he doesn't need it?) it would be neat if Frieza was also holding back on another form lmao, like it took Frieza two months to achieve the golden one and then two more months of training in that form to achieve a second one.
Since he still seems to be scuffed up from his bout with "base" Goku, instead of it being like "Guess I WILL have to go Super Saiyan! Is this what you wanted Frieza D:<?!" an just winning, Frieza is actually like "I've been waiting for this moment, would it bring back memories if I told you...this wasn't even my final form *smirk*?" an it cuts to all the Z fighters faces like "WHAT?!". I mean the dude is basically the poster boy for having another form hidden away, it would be a cool nod to the first encounter with him.