I just dont understand why it matters so much how high a tackle can jump or how fast he can run. I just want someone who can pass block. It wouldnt hurt to be able to run block either.

Playing guard however is a much different animal. At guard you have a fist fight in a phone booth, very limited space you need to take care of and guys on both sides which helps a lot. At tackle and especially to the left it is wide open spaces and a track meet in all that space.

Throw Armstead in there from day one if he is atleast 90% as good as Brown.

The best man will get the job.