Well
To clarify the question. DO you progress it in Linear order of bosses or you skip?
From beginning of current HC switching model (ICC for those who dont know) there were some really loot pinata difficulty bosses (Lootship) as well as stopwalls in middle of raid (Twilight council, Animus). In SoO the difficulty of HC seems to be perfectly linear with really minor bumps in matter of single % of wowprogress instead of Tenths of percent like Jikun in ToT.
to begin we progress linearly in 25, currently 7/14H