Yes megumi was originally the deuteragonist. I see a lot of people coping on this fact now but that was the casw in the og series at least for a point.
The entire legacy of Megumi's character was nothing more than to be a win con foe the main villain against the good guys mentor figure and for two other people (3 if you count the guy Gojo spoke about in the past) using his own technique better than he did. All that build up towards to the culling game just to do nothing with it.
Skip to Modulo and the most Gege did was give a literal throw away line from his supposed best friends. It was literallly just an "oh, here you go" moment that gege barely felt like including.
We shit on Nobora but she honestly got a better treatment from Gege. Nobara literally did more to stop Sukuna than Megumi, in fact im willing to say Megumi actually did more to help Sukuna than even Kenjaku. Because of Megumi, Sukuna had extra options during the Gojo fight, because of Megumi, Yuta and Yuji's tag team within the domain failed.
We dont even know if this man had a happy ending post the Sukuna raid becausw Gege didnt give us shit. Not that he had a family, got with thr angel girl, nothing...and the straw that just recently broke the cammels back, Gege gave illustrations of older characters of the main cast of everyone BUT megumi.
Yuta who also dead got official art of his older self. Where the fuck is megumi?