No definitely not. We've finally got a ruck combination good enough to worry any team; the last thing I'd want to do is change that. Not to mention that what passed for our rucks in the Prelim got beaten easily by Hawthorn's, it's time to rectify that.
If you did want to bring in Walker - and they could have last week after a better VFL performance and didn't - then Blicavs is the only option I can see. But that isn't going to happen.
Just the way you posted it made me infer that was your thinking. I like the Big2 setup , 2 real rucks , but I wish 1 was a little more mobile/agile. Anyway , this stage of the year when the result is not do or die its good to run it and find out. Is the Big2 too slow for the Hawks...well lets find out