Remember folks, the trigger point that makes MS's investment worthless is reaching AGI point as that then triggers the charter rules to take the IP back out of commercial products....that is the crux of the firing...one board faction felt they had reached AGI and the people that were forced our or left felt they had not yet reached AGI.
From my brief dealings with SA at Loopt in 2005, SA just does not have a dishonest bone in his body.(I got a brief look at the Loopt pitch deck due to interviewing for a mobile dev position at Loopt just after Sprint invested).
If you want an angel invest play, find out the new VCfund firm Sam is setting up for hard research.