That is indeed their plan, but I'll tell you how it's gonna go down.Ineos might not have anybody strong enough on their own imho. They need to bring as many guys as possible, as close as possible in GC, as far as possible into the 3rd week, in order to play their numbers if they want to actually have a shot. Jumbo and QuikStep aren't going to let Thomas or Hart go, and if they did attack, chances are they would only expose their own team mates. And instead of 5 guys close in GC at the start of the 3rd week, they would have 1 or 2 at best. And on their own, that 1 or 2 riders aren't strong enough to deal with Roglic and Evenepoel, most likely. If they can get into week 3 with 4 or 5 riders, they can start forcing hands by sending multiple riders in the attack, who are all too close in GC to let go, forcing others to react and possibly overplay their hand too early.
If they were to set up an Ineos train, they would just be doing the work for Jumbo and Quickstep, so that's also not an option. For Ineos the current situation couldn't be better, they have no reason to blow their own riders up at this point, they would only shoot themselves in the foot.
At the moment they're all "Let's keep Hart, Sivakov, Thomas and Arensman up there untill week 3 and then we'll strike!"
And you know what will happen between now and week 3? At least two of them will have lost major chunks of time. Be it bad luck, a bad day or others just being better, it doesn't matter but it will happen. And then they'll say "Ah, too bad we've only got X (and maybe Y) left up there in the GC. We don't have the numbers anymore to go into full attack mode."
Yeah, if they tried to attack today (I would've gone the Sivakov or Arensman route in that case btw) maybe they would have ended up with only 1 or 2 guys in the GC. But we all know come week 3 that will be probably be the case anyway. Better do it on your own terms and cause some mayhem in the process. And you know, they actually might have been succesful. I'm not saying there was a big chance, but it wasn't completely outside of the realm of possibility either.
It would have made for a more entertaining stage, they would have earned some respect, and Jumbo and QS would probably be in a bit of a panic as something unexpected always seems to f_ with the mind of the teams with the favourite(s).
Another thing; in week 3 they won't all be that close together anymore in the GC. If they had attacked now, chances are a lot of teams would look at eachother to chase them down. I don't think Bora or Bahrein would put in any work: they'd all be looking at QS and Jumbo. (Likewise of course with Ineos were Bora or Bahrein to attack today). In week 3, a lot of teams are already consolidating their position.
On another note, when you wrote this:
You were talking about later on in the Giro or were you talking about this stage?If they intend to do what i think they want to do, it only makes sense for them to hold off as long as possible. Their best chances are to wait as long as possible, while having the most options to attack. The sooner they show their hand, the sooner all their other riders will likely get exposed.