The Ark crashing on the Moon would predate the war for the Allspark. Sentinel Prime wakes up in the modern day finding out a war broke out on Cybertron itself and his old friend Shockwave is at the Decepticons side. Leaders for for the past two films has had brotherly relationships only to be broken. Optimus Prime and Megatron, The Fallen and the original Primes. Take it like Skyfire in G1 waking up finding Starscream has changed over the centuries.