I understand the concern but I would look at it like this -
Zetterberg, Datsyuk and Alfredsson did not play last night... Based on the teams current chemistry, those 3 will become our first line when all are healthy (fingers crossed) during the playoffs.
Nyquist - Legwand - Franzen who will be our second line and no longer playing against the toughest pairings/forwards on the opposing team (see Nyquist vs Chara every shift against Boston) which I cannot wait to finally see.
Tatar - Sheahan - Jurco will become our third line instead of our second line and wont be counted on to score as much as they currently are - typically this type of exposure are where I believe younger players can really contribute. And finally, the best 4th line in hockey:
Abdelkader - Helm - Glendenning/Miller/Andy provides unbelievable speed and 3/4 of our penalty killers. This line can be used on the road as our shutdown line or at home against the other teams 4th (however Babcock sees fit)
All in all, you are not disrupting any lines, instead your basically acquiring a 1st line that consists of world class talent, who have made a career out of playing together. Add Alfredsson as a complimentary right handed shot and I honestly don't see how anyone is worrying about compromising the teams current chemistry.
Those are my exact lines right there. I really really hope jurco doesn't come out because that kid line isn't the same when he's not in