Now that I've seen the pics of all 4 modes, I agree with you Tetsuwan 4 modes is kinda pushing it considering it's really only 2 modes with slight variation to make the other 2 modes.
Once Shockwave is finally seen by the Autobot forces it cant take them more than 3 seconds to realise it's Longarm, unless of course the Autobots have that problem where a pair of glasses throws them off from telling that Clark Kent and Superman are one and the same...
:p