Metal + Lightning El Drago

Hi i have 2 questions.

1. When the metal fusion wheels on the blades turn a darkish colour (I think this is called oxidising i forgot) does it mean the fsion wheel becomes more fragile?

2. Also, which attack blade should i purchase Storm Pegasis 105RF or Lightning L Drago 100HF. I read up on it and it seems pretty unbelievable that left spin blades 'steal' your opponents power considering your opponent has a right spin blade.

Thanks
for your second question, they are both extremely good purchases but you need both to make a top-tier bey
Do not make new threads for questions.

Lightning L Drago isn't good at all at spin-stealing. Meteo L Drago II is better. When the blades turn darkish, the colors are only fading, the bey itself doesn't actually become more fragile.
The colour of the metal becoming duller just means that the shine it had when unused disappeared, with oxygen and battles.