Wouldn't it be interesting if Goki was right, though? Between that and the Protoform X experiment it kind of puts a different slant on the Maximals, who come off looking more like the Animated Autobots. It'd also kind of explain BW Megatron's urge to 'free' the Predacons from Maximal rule.
If Blackarachnia did have a pre-Earth personality I'd be inclined to put it as a sassier, snarkier, more sultry version of Prime Arcee, eager to get off boring Cybertron. But that's just IMO, and if we're looking at canon then BM Blackarachnia is the most likely bet.
*shudder*