Shouldn't bloodtheft have a scale with regards to bloodline strenght?

What I mean is that someone of great or true bloodline should probably not gain much if any power when bloodthefting someone of tainted or minor bloodline. This would be similar to having a CR rating for bloodlines, so that awnies like the Gorgon, Rhuobhe or Spider would only reap the benefits if bloodthefting great bloodlines and only a tidbit in the case of major or minor ones.

That would also explain why the Gorgon, for instance, goes to great lengths to "nurture bloodlines" over generations and then "harvest" them when they "ripen"