Having a lineup full of two-way players is not a bad thing at all, hence recent success of such teams like LA, Boston, etc. However, good two way play and an emphasis on defense isn't going to win you hockey games unless you can score goals. The score is measured by goals for, not prevented.
Adding offensive players such as gaborik and carter propelled the kings to overcome their scoring problems and win cups. You can't just dispel this by saying other teams geared up too...there are 16 teams per year trying to do that, not just one. That's not the point of what I'm trying to say anyway.
Maybe what I forgot to say was how it relates to the sabres and this whole player type debate. Having enough two way players without enough offensive emphasis and skill can lead to a hard time scoring goals. Thus, adding a player of the "Crosby type", rather than the "Toews type" can address possible scoring issues, and any defensive neutrality/liability can be compensated for by not only greater amounts of production, but other teammates' contributions (for the kings, this would be kopitar, stoll, richards, brown, etc complimenting carter and gaborik bringing more offense).
The Sabres have a fair amount of two way players in the pipeline that can provide this type of support with further development and time, I dropped specific names earlier. With this abundance, and no elite offensive talent in the pipeline, I think it would be more beneficial at this point in time to build around a "Crosby type" than a "Toews type". That's my point.