Building on what DW mentioned, maybe consider allowing for a minimum of non-favored maneuvers for the Master of One? Either 3/4s or just a simple majority should work, as there are 9 disciplines anyhow and having at least half come from your BFF-one should suffice. The exact wording could use a hammer, admittedly.

However, if you did intend for it to be more in-line for non-swordsages, may I consider increasing the BAB to good?