I could go on for pages about warbird hydraulic systems but basically they follow path of least resistance or friction as some have called it. If the resistance is very similar, then the gear will go together, if an iactuator is "sticky" or a gear pin etc is tighter, then you will see gear that seem to be independent . Some have accumulators,some have hydraulic timers that keep system "live" for a few minutes then go into bypass mode,some have electrical actuated bypass systems (t-28) which are triggered by the gear up,flaps up,speed brake up,canopy closed micro switches. The t-6 has hydraulic gear and flaps as does the p-51.The b-25 has hydraulic gear,flaps ,Bombay doors,cowl flaps,and brakes. The pby Catalina had hydraulic windshield wipers and some autopilots used hydraulics as well. That's enough,now back to building.