When you have your FI Restriction removed, you can not only send students on their first solo, but you can operate unsupervised and more importantly you can become a supervisor of other FI(R)s. If there was an accident, the buck might stop with you. A court would look to see if things had been done in a reasonable manner; if they considered that it hadn't, the liability could be emense! If you have fudged your 25 solo sign offs you may have fooled the CAA but its the Court you will need to worry about! 25 sign offs don't guarantee anything however, there is an assumption that if you've had sufficient time to accrue that experience you might be capable of operating on your own and supervising others. Its still a damm site easier and cheaper than the previous system.