It's not terribly complicated. If Brad wins the Giro, or does well, he'll want to try and do the double. If he does badly in the Giro, he'll want to do well in the Tour to compensate. And either way, he's the defending champion. He is not going to France to make up the numbers, he (quite rightly) wants to do himself and the tour justice. Anyone expecting him to just roll over and play super-domestique to his number two is plain silly. He is, to his credit, being honest about this. He's certainly not following Bernie's example from 85/86....
If Froome (and his lady friend) were being truly fair and honest, apart from keeping their counsel, they'd accept that (i) He'd rather win on merit, not just on account of Brad being told to slow down- and no-one else is going to do them any favours anyway, doh! and (ii) It's better for Sky as a whole, Brad, Froome (everyone apart from their chief rivals) that they have a Plan A and another Plan A. If one of them has a season-wrecking injury, they're ready.