In all prudence, as an admin you should take a more proffesional and also let's say a more neutral approach. Button would have to do a lot of wrongs to be ousted from McLaren, and having an experienced driver for next year is clearly important. When two drivers show similar speed, but Button is one of them, he would always get the nod, atleast as long as Whitmarsh has a say.
Hehehe, he's been very so-so lately, but getting caught up in a first-lap touch can happen every now and then. Still, three races on the trot.... not good.
If you would like me comment with a more considered response then I certainly can.
Your stated position is that Button is slower by a not-very-exact margin of specifically measured time ("a few hundredths") and Perez allowed a certain yet indefinite period of acclimatisation ("there is (normally) quite some time") which could still be ongoing for all I know, followed by a subjective statement of ability ("racecraft is better") which you are now not so sure about ("Still, three races on the trot"). Between you and selespeed, there was an unverifiable and contradictory judgement based on unsubstantiated fact. The post is phrased as if hewn from Cairngorm granite but really has no substance.
You provide no information about how you are measuring your hundredths or by which benchmark it is measured. There is no allowance for acclimatisation only an absolute certainty in your own mind that Perez should be allowed it. I can't even imagine how one measures racecraft and you flip flopped on that anyway so probably best to leave it well alone but move on instead to the final coup de grace which is the suggestion that if two drivers were similarly fast then as long as Whitmarsh says something, Button would always be the one to stay. That you chose to put this solid gold troll right after admonishing me for the poor quality of my response is a dish far to rich for me when served up by a former moderator.
Button has been criticised many times over his career for being slow, or poor at defending or poor at overtaking, or poor at adapting, and yet he's seen off a number of teammates not in terms of Team Principal love, but results. We even have a thread dedicated to trying to come up with a points method which stripped him of his 2009 championship, if you search. The criticism will probably be valid one day if it isn't already. His reaction speeds will slow, his ability to read a race will be impaired, or there will be one too many knobs and dials on the steering wheel and he will move on to other things or down the grid.
However, from the end of this year Button was out of contract so if his performance was found wanting or he was surplus to requirements, he would be gone from the end of this Sunday's race. McLaren know what he is capable of, and they consider he will be a good model for Magnussen to learn from, so he stays. Not a slow, erratic, little-bit-shit or incapable model, but a better one than Perez might be. They brought in two new drivers the last time they had a hot young prospect so there was never a guaranteed place for Button.
The quality of a driver cannot simply be measured by his 'raw speed', even if you could come up with a measurement to define what you mean by that. His quality is measured very simply by his ability to translate whatever abilities he does have into results. Button has provided those results over the course of the season and Perez has not.