Random quickie questions

[Fanta32]

Hi folks looking to start a thread for folk to ask questions and other to hopefully answer them, for example here are some of mine

When is it best to fuse two commanders?
Why does adding helicopters slow my army in travel, surely faster than tanks? (I feel its to even things up and prevent huge power units zipping across the map on snatch and grab missions)
How will I know which commanders are best to absorb?
How do I protect more resoucres.(found out its by upgrading command centres)

Maybe even a gree rep can help answer some aswell