Finding out that there's a Spartan II that is called Michael, who is ' technology and computers.'
Michael-120[1] is a SPARTAN-II and member of Gray Team. He is an expert with technology and computers. In 2517, he was kidnapped from his ho
' Mike was a technical prodigy: he could use any device with expertise after watching it being operated only once. '
So you could go with this and say this is Caboose before he got the brain damage or Caboose is a 'stable' clone** of this Michael. or... Caboose is a AI dun dun formed from this Michael.
Michael also is listed as MISSING not Killed in Action.
** i know in Halo clone tech is unstable and used mostly for organ harvesting and creating AI, but... listen. Let me cook.
( Rp wise, my headcanon is that this is my Caboose's dad. )