This will be interesting for sure as I think you will have a tough time proving manipulation. We all know it when we see it, but what is the actual standard
What qualifies as 'being ready'? Vlad and Bryant both destroyed the minors before getting called up. Bryant put up 6 WAR that year, Vlad .4
When is too close to the deadline for an extra year of service? It was 12 days for Bryant, is 20 days to close? Is 25 days? This could just move the goalpost.
I think this will be more difficult to legislate than most give it credit for.