Tactics for the Stronghold.

The question of Ogres has already been partially discussed, but there are some unclear points: 1. If there is a single Ogre dwelling near the castle, and there are not enough resources to build Bears + a castle, does it make sense to ignore the Bears and build Ogres in the castle instead? After all, it is much easier to upgrade them than Bears, and the power increase is very significant. 2. How should one approach the Ogre specialist? Is it worth investing in him if you decide to focus on Ogres? Or would Kreg Hex be more useful even then? 3. It has been repeatedly mentioned that Bears in the castle can be placed without problems in the first week. I suspect this is due to the presence of Necropolises and Dwarven Mines? But what if, besides a weak Imp town worth 2000 gold and a couple of chests within a three-turn radius, there is nothing else?