If they see a bunch of pitchers lumped together on their board, and expect plenty of candidates between say rd 8 and rd 20 that don't have a lot of separation, taking a few OFs back to back won't faze them.
They are focused on speed, I think that reflects having Harper and Walker on long-term deals, and possibly extending Bohm. So limited opportunities in the future for 1B/LF/DH types - they want prospects who can play the field and protect hit first guys.