again, looks better for juvenile LBBG, probably intermedius.
slender built, very long wings (but equally long in some female michs), very tidy and fresh juvenile plumage (same for YLG at this time of year but with a rufous tingue), pattern of inner GC better for LBBG, imo.
differentiation between juv mich and graellsii/intermedius can be a real challenge...
this bird however instantly struck me as being a LBBG (which i guess is as good a species as YLG on gülper see)