The problem with your hypothesis is why are patrol planes outside the early warning envelop?
Another is since the six generation plane would be equipped with ultra-stealth how could the on-board radar on a combat plane on patrol detect the stealth plane which has lower power?
The on ground SAM radars are able to detect 450Km while the air patrol plane is only able to detect around 30Km against stealth planes. So if the drones were to able to detect the air patrol via passive radar the air patrol plane would be dead meat before it was able to detect the 6th generation air plane which has a longer arm in radar sensing.
At then end a missile would be heading towards the combat air patrol way before it sees the 6th generation plane coming towards them.
I agree with SB that the pictorial presentation that you provided is somewhat problematic when you correlate sensor range, standoff HARM threats and CAP axis.
Currently it is estimated that the detection range of a F-35 by a S400 type radar sensor is around 20 NM. It is projected that by 2030, the detection range is expected to double or treble. It is with this in mind that the notion of system of systems was developed as part of the 2030 Airforce's plan to be able operate in dense IADS environment through man and machine teaming. The idea is to inject into the densed IADS using UAV rather than risking manned platform while the latter operates out of the main threat bubble.
It should be noted that while the F-35 is able to operate within current threat bubbles, that will increasingly be more difficult progressively without matching enhanced capabilities. Rather than such development being concentrated in a 6th gen platfiorm, the idea is to distribute the development across systems.
The recent exercise reported from the Tyndall airbase regarding the performance against F-15E's is testimony of the capabilities of the F-35. It should be noted that the F-15E's are probably equipped with APG-82 AESA which is the most modern found in a 4th gen aircraft. The result demonstrated that the F-15E's were rather impotent against the F-35's.
https://www.sinodefenceforum.com/f-...er-news-videos-and-pics-thread.t5796/page-343