I think that spar rating should be displayed in profiles. However, it should be optional in case people don't want others seeing their rating.
If there isn't enough space, I think rating should replace the losses statistic. The problem is that people still use the win/loss ratio to determine how good someone is, which isn't entirely accurate. If a good player only spars noobs to preserve their high w/l ratio, they will maintain a good one. If a pro only spars other pros, their w/l may be near even.
The rating system used for spars is a far more accurate indication of how good you are, because it considers how good your opponent is when adding/removing points and also is easy to change(say you sucked for a long time and had like a 3000-5000 record, but improved and are now the best sparrer on the server. Your win/loss would still stuck and people would assume you are bad.
Wins should remain on profiles, because they represent how dedicated you are to sparring and are an overall achievement, much like kills.