A FMC is described as completely envisioned and controlled by the caster, putting as much time into it as the memory covers; so Dumbledore in FMCing a baby Harry is choosing every detail of the scene. Given that… why would Dumbledore direct a scene like Harry recollects? It has several oddities which reduce its value as a ‘you killed my parents! In the name of the Moon, I will punish you!’ memory.
A FMC is described as completely envisioned and controlled by the caster, putting as much time into it as the memory covers; so Dumbledore in FMCing a baby Harry is choosing every detail of the scene. Given that… why would Dumbledore direct a scene like Harry recollects? It has several oddities which reduce its value as a ‘you killed my parents! In the name of the Moon, I will punish you!’ memory.