multi egbert theory is pure cope bargaining from people who don't really like the idea of june being canon but don't want to seem transphobic i really don't think it will be entertained. people often point to roxy when it comes to this but ignore/don't know that candy roxy has a similar gender thing going on to meat but didn't have the opportunity to experiment. multiple universes in homestuck have never really been shown to make someone a completely different person unless they literally fuse with another being. you can always see part of their base personality reflected even when their entire life is different.