To make the Cronos useful, you have to keep your troops close, which means slowing things down considerably as far as your movement, which might not be such a great idea.
Although, if you only have the Siphon as a weapon and no opponents near by, running will help this a little.
If you want to use the Vortex, while still retaining the usefulness of the Probe, You could do a 2 Cronos Squad (or 2 seperate squads), one with each and go from there. But the Talos and Cronos will always suffer with a 6" move and lag behind unless you make conscious decisions in how to position and move your units.
I don't know that I've played a game recently without my Dark Artisan Formation. Whether it was successful or not is another story. Good distraction either way lol.
Kabal of the Tormented Scale