Krusty,
I think as long as the intent of the credible force rule is followed, no one is trying to "game the game"... or perhaps I should say... I havent seen anyone trying to do that. I have seen, and been a part of several "dual wave" missions, and the planners (including myself) are always careful to make sure we hit the target with the majority of our forces by T+60, and in most cases much sooner. A second, and much smaller wave coming in a few minutes later just seems prudent... to ensure all of the targets we are assigned are taken down... or at least an attempt to ensure that.
In many cases... the primary wave gets jumped and butchered... as it so happened to us in Frame 1. We had a second "wave" of 2 bomber formations and 2 escort fighters following about 5 minutes behind the primary wave of 8 formations and a full squadron of escorts. Even the second wave only made it home with half its forces, and the primary got ripped apart before reaching the target... leaving most of its objectives untouched.
From a defense standpoint... our squad now assumes that every strike mission we defend against is going to have a second, or follow up wave hit shortly after the first strike, and most likely from a different direction. Sometimes they come in high... sometimes NOE. I dont see that as breaking the spirit of the rules at all... rather I see it as a CiC or CO making the most of the resources at his disposal.
Unfortunately, I am sure there are those that would see the omission of the "credible force" statement in the general rules, as a loophole. And as such, it should be closed by defining it more clearly and completely... and making sure everyone knows it applies to ALL FSO scenarios and frames.
EDIT: However I think that this is probably a discussion for another thread. The OP intent I believe was to argue the point of B-17's outperforming the Axis aircraft at 30,000ft... giving them little or no chance at engaging them.