It was time to choose which bike to keep (limited place in the garage, and too many bikes ). I decided to sell the Merlin FatBeat (cracked at the rear some times later), and to go on with the Dean.
Later i heard a regular noise behind me when riding, i thought seatpost or saddle. In fact, a lateral play appeared at the top attachment point of the rear shock I tried to correct this play with washers, but i was thinking it wasn't the right way to fix this issue.
As the stickers weren't in a good shape, the chainsuck very noticeable, i decided to send the frame back to Dean