Yeah, this is interesting, I think he has his count wrong. In looking at the MLS site, I've got:
- 5/26 - San Jose over TFC
- 5/25 - Colorado over Columbus
- 5/25 - Portland over Philly
- 5/24 - LAFC over Montreal
- 5/24 - RSL over Atlanta
- 5/24 - LAG over Orlando
- 5/22 - NJRB and Vancouver draw
- 5/18 - Houston over DCU
- 5/18 - Minnesota over Columbus
- 5/11 - Chicago over Minnesota
- 5/11 - New England over San Jose
- 5/11 - LAFC over Columbus
- 5/11 - NYCFC over LAG
- 5/11 - NJRB over FC Dallas
That's the last 14 matches between Eastern conference teams and Western conference teams going through the schedule on MLSSoccer.com. It's possible I've missed one, but I don't think I have as I've double-checked.
That there gets us to a record for the West of 9 wins, 1 draw, and 4 losses. If you cut it off at 5/18, it's 8 wins, 1 draw, and 0 losses.