What is pshat in the hekesh between Avadim and Karkaos? That really Avadim are מטלטלים just with respect to certain matters they have a דין קרקע. Or no - the hekesh teaches that Avadim have an ESSENCE of קרקע and when you look at Avadim - you are looking at קרקע.
What is the na"m [נפקא מינה] of this chakirah?