An interesting post, although I would ask what evidence there is for the above statement.
Observational skills can be distorted by bias or ability, a person wearing blinkers might see differently and so the 'evidence' has to be seen from a wider perspective to make sense
I.e don't ask for evidence and then say that you don't see it as evidence. If you had a theory then your evidence would suffice, as you don't and I do then my evidence suffices. Please remember that you have mentioned evidence, I will assume you mean my reasons as if you had read my post I say that I am only observing and deducing not being privy to inside info
Finally remember that, as I stated previously, my 'evidence' is therefore no more than my observation and deduction
So on to my observations that lead to the deductions? ( your yearning for evidence)
McLaren rearranged the process in the garage, bringing two sides of the garage under one control and centralising data and therefore centralising setup and development aims
Both drivers have different preferences wrt oversteer/ understeer, rear downforce and grip, and pointiness of the front
An F1 insider from Autosport points towards McLaren making decisions with complete disregard for LH in the assumption he can drive round issues and JB can't
Numerous examples of LHs race compromised as a result of pandering to JBs
Lh left out on old tyres because JB missed his pit slot
I haven't got time to be trawling my memory to satisfy a need for 'evidence' for a speculative notion, if it doesn't feel right to you ignore it
The most recent and perhaps most pertinent observation is of the recent radio transcripts pointing to corroboration of my theory of the dynamic within the team