Yes
No
If blue is now splitting does that mean the other colours are also splitting.
since when is blue/yellow the only colors of the rainbow? This should be at least a 4 color breeding, maybe even 5 (yellow/red/blue/green/purple). My opinion anyway.
Well if we believe in TL that telling us Blue & Yellow will make rainbow, then we need to believe TL telling us Blue spilts into Blue & Green is not a glitch right? One day if TL telling me a Pig can fly I will believe them with my whole heart too..