I am of the belief that, historically, the Blues have built rosters with too much 3rd/4th line skill sets. We all loved Sobotka (version 1.0) being able to move up and down the line up. Same thing for Brodziak last year, but that was out of necessity as we had no other options once Stastny was moved. I think the Blues problems have been a lack of #1c, and diversified scoring, so giving playing time to 3/4 liners will never fix that issue.
I would welcome seeing a young, fast, high-pressure 3rd/4th line strategy that can provide incremental offense. Recently, that has been a black hole of offensive opportunity.
I remember Jacque Demers playing A young Doug Gilmour on the 3rd line and shadowing the other teams top players. Jacque would say that seeing how those players work without the puck, would make Gilmour a longer-term offensive weapon.
I’d rather see Thomas have to match up against Toews, Schiefele, Seguin, McKinnon, Koivu, and really learn the secrets of being a dominant 2-way player.