No they're not man lol. Sheikhaal have Ethiopian admixture in their DNA results.
Sheikhaal don't have an Ethiopian admixture you just pulled that out from your ass. One of my friends tested 95% Somali and he's Sheikhaal. They have a few outliers with strange Y-DNA coming from the middle east but none have anything to do with Ethiopians. They are mostly pure Somalis like everyone else.
No, Hadiya is located away from the highlands to Zeila route. It was on the other side of Shewa towards the west. I don't know what you're talking about.
They were still collectively part of the Muslim chains. Ethiopian highlands doesn't only apply to Christians nor every Muslim Ethiopian state were Habesha either.
Quite simple Hararis claim Zeila but according to the Cambridge African history shows, they were highland farmers and had nothing to do with the arid lowlands.
This isn't true. Silt'e, Argobba, and hararis all come from Shewa. The Arsi Oromo you're talking about aren't even pure Oromo, they assimilated Habesha Aderes.
I already knew that but the Hadiya language is considered east highland Cushitic. They have nothing to do with Habesha Muslims apart from sharing the same religion.