I say we trade Balo + money for Cesc from Arsenal that is the dream.... Mario is a beast but under current management I don't think we can make him World Class
Arnau has not gotten any shots and will cost 10 million euro.... (we don't need another Jimenez). Come next December if any of our 3 starts stop scoring we will just buy another super expensive striker and this kid won't ever get playing time.
although ur assumption is very tempting but i wod rather keep Mario for good ... there's no need to rush him into WC thingy..
and Arna is pretty good for his age, he just needs to improve and adapt in Italy for now, he is a future project, no need to rush too! .. he's got a lovely touch and we shodn't waste him..