that the point, timo is a experience driver and it was pouring, why take the gamble to carry on dry weather tyres?
Their team took the risk too, not to pit
if he(T. Glock) pit for wet tyres he will also fall behind
Hamilton.
That's the calculated move by McClaren.
If S.Vettel did not pit, he will be miles away
by the time Hamilton returned to track after pitting,
but not T.Glock as he was slower and very much further behind,
so for him to pit or not to pit, by McClaren calculation,
Hamilton will still be fifth, very close, almost back fired
rather than he did not pit and spunk out of track.