Im thinking because i used an S5 housing, when i placed the rotor
in the housing i felt uneasy because i was able to wiggle the rotor while it was in the housing.

When my dad was revving it, he was doing so constantly without letting go, it snapped and then we turned it off, when we tried to turn it on it would lag.

I think it was mainly because of the S5 housing along with the obvious variables,

 

rotor housing has nothing to do with a spun bearing.