I seem to recall that there was still a threat of rain at the time people were coming in for Slicks, such is the nature of the track, I remember Button being told that his inters would need to last the rest of the race at one point.
Could it be that McLaren were trying to save a pit stop by eking out the inters? if it had started to rain when it was expected to, then he would have needed an extra pit stop. Inters>Slicks>Inters/Wets, and following on from Hungary last year, maybe there was an aversion to that, hence the more cautious approach, and the follow the leader. If it had rained again, all the drivers who had come in for Slicks would need to pit again, meaning 2 stops as opposed to 1.
The fact that it did not work leads to the debate, and to be honest, without the threat of further rain it does seem like a no-brainer, however, they could afford to take the risk with Button, for all the difference it was likely to make. Hell, they could have sent Jenson out on square tyres.
This is not a cock up of the proportions of Ferrari sending Kimi out on wets in case it rained, and if the expected rain had come (I know, a big if) it may have been very different.
quick question, did Lewis close up by 12 seconds between the pit stop and the end of the race?
Edit: similar point to the Artist, apologies