I'm well aware of Lyon's financial troubles and the Mangala debacle, I mentioned it on the last page!
With this though I don't think Textor has done anything wrong. I doubt Dobbin, Kellyman, Anderson, Gallagher etc envisaged they'd be used as pawns to cook books when coming up through the club's academy but needs must. Nuamah only joined Lyon last summer (through some clever accounting with Textor's Belgian side) and given his ceiling likely saw them as a stepping stone, it's really not as deep as people are making it out to be.