Here's my hopefully more tonally correct post. Don't want to hop on the forums as a ****** after all!
So I think the big key here is that Bestigors act as a better sponge and thus fill the role of hanvil (hammer and anvil) better than 2 units of Gors. While Gors outperform Bestigors on a 5+ save by 1 wound per 220 point increment - a single unit of Bestigors have several advantages that outweigh that.
Bestigors are easier to shield against Battle Shock and often doesn't require the CP usage to negate because of the higher wound count). They also absorb things like AoA and Wild Rampage more effectively, and they have a 2" reach which means they're often getting a higher amount of the total potential swings in (particularly in Gal Vets). Additionally in AoS it is often advantageous to only want to fight with one unit a turn - Gors can proc strike last but if it fails you can find yourself at a disadvantage in your planned trades in the combat phase. Finally I think there's a strong synergy between Bestigors and Monsters - opponents don't want to issue AoD against Bestigors quite often when frees your Monsters up to stomp and add a few extra MWs to the combat tally instead of spending your rampage on a roar.
I would also love a reduction in cost for Bestigors but I genuinely believe the current warscroll, even at its current, cost is very viable in the army (at least in the current season with the battle plans laid out like they are). I don't think Bestigors are an auto include at all, one of the strengths of the BoC book is its flexibility for sure. But I do think that they're worth experimenting with - I shied away from them when the book came out because of the general negativity surrounding them and I'm very pleased that I re-thought that decision.
