Push-push oscillator using (!)one transistor theoretical question =)

[Terminator3]

For example, we have 5Ghz oscillator, output goes through microstrip to power divider, splitted to two microstrips.
Microstrip lenghts choosen to provide 180 deg phase shift. Each microstrip equipped with SMD circulator, that prevents unwanted direction.
Then we put power combiner, as in classical push-push oscillators. Is there any problem with such design?