Can someone help fill in the blanks here around how/why Fab moved up to Moto2 in '16 given troubles in '15? Ty in advance.

https://en.m.wikipedia.org/wiki/Fabio_Quartararohttps://en.m.wikipedia.org/wiki/Fabio_Quartararo https://upload.wikimedia.org/wikipedia/commons/thumb/5/5a/Francesco_Bagnaia_leads_the_pack_2018_Motegi.jpg/1200px-Francesco_Bagnaia_leads_the_pack_2018_Motegi.jpg