So basically you can expand your 3bet/broke range simple as see what kind of hands a MSS go open/4bet/call with right?
For example, you see a MSS went broke with 77, your broke range immediately expands from AQ+,TT+ into AQ+,88+?
Then next hand you saw the same MSS went broke with AT, your broke range immediately expands from AQ+,88+ into AJ+ 88+?
So overall everytime vs this MSS i will have broke range of AJ+ 88+
This assumption is based on the MSS have a very rigid and systematic playing style that will never change (which actually exist alot in the lower stakes)