Not just in theory: You already said the Arma Gigas she summoned in V4 was smaller than in V3, and if we think back to the fight Winter vs. Qrow (btw, Qrow was just playing with Winter, while Winter went all out and got b*tch-slapped across the battlefield), Winter summoned Nevermore the size of regular birds, so it´s already canon that the size of summoned beings can be altered.



Speaking of which, in my RWBY fanfiction, RWBY Re-Writes, I threw my OCs in the cast of characters involved in the events of V4, with one of them helping Weiss with her summoning.

I don´t want to spoil too much, so if you´re interested, just head on over to my DeviantArt page and check these things out.

New parts every saturday, and don´t worry if you missed a part, or are only interested in one part, they´re partially independant stories, exept for the 5th, and last, part. You might want to read part 1 before that.

Other than that, though, you could read the parts in any order you like.