If the Americans had any sense.. and chances are they do.. then the F22 is going to be 'visible' at all times whilst 'others' are playing... so that they can be seen...always helpful and to prevent anyone even knowing what the non enhanced return is like.. regardless...
Even if they are not airborne at the same time prudence would dictate that the 22s are operated in normal mode...why give anyone the knowledge...
However between seeing it and being able to do anything about it there is a world of difference,, you can see it perhpas, may be even track it but could you get a guidance system to lock on? Or perhpas use the tracking to slave an optical tracker? Who knows.. but like seeing car headlights in the distance, useful yes...you know something is there, but until its close you have no idea of what/how it is......
Sad tho that all that money has been spent and at least ancedotally it does not seem to have delivered the announced goods...