I don't even understand your mindset if you think that the only reason he's scoring is because Segunda is shit. For christs sake the B team gives him very little if any service at all and have no midfield control throughout the entire match. Imagine what a step up it'll be to be serviced by players like Messi, Iniesta, Xavi, Cesc, etc on the first team. Also, as it was pointed out before, players like Aspas and Castro have been very good in both divisions and made the transition with ease. Deulofeu is at the very least doing much better for the B team than either Cuenca or Tello did with a very bad midfield to support him.