Tarasenko is the cap part of the moves for the Blues, not the quality long term piece. That's either Kyrou, NEighbours, Paryako, Bolduc.

most I would do is Tarasenko, Neighbours and a 1st. otherwise I would wait until he is a free agent

From what I've read, CGY isn't going to let this situation get to arbitration. Either a trade or a longterm extension; letting him get to a 1yr deal could be a fireable offense. If Tkachuk's camp makes it clear that there are only a few (or one) team that he will sign long term with, that cuts into their leverage but it still should yield them a better return than they'd get if they try to move him on a 1yr deal.

If it comes out that he only will sign long-term in STL, I could see the pkg you have - Tarasenko (could go to a 3rd team), Neighbours, 1st. Otherwise with competition I think the Blues would be offering a little more. Probably not as extreme as some of these armchairs I've seen lately, holy smokes.

And Parayko if he agree and some cap exchange to make it work

I would gamble he's probably an 7M to 8M player without Johnny