It is possible if you are able to see similarities by breaking it down.
Start to check on this variables:
Time of entry
Lot Size Deviation
Avg holding period
Using the info go back to the Trading chart to see if you can spot any similarities at the entry level.
As long a human is manual trading, there is a large part of discrepancies and discretionary decisions involved.
If he/she is so systematic, it would be way easier to just program their system into EA instead of trading.
Most often, successful manual traders come with gut feels, discretionary manual decision making on exit points through market volatility and anticipation like if they want to cut loser cut, or bring a trade into a news event, breakeven or let profits run and so on., There can be many factors involved.
A system with 75% WR is too high and too good to be true, which is likely less than 1:1 RR or maybe the pips expectancy was lower.
The bigger the TP, the spread and also longer trading duration increased the uncertainty in the market.
My 2 cents.