I can see things going each way. The question is: When drafting position players do we go by their primary position only for their draft eligibility?
I did my draft board for players based on their primary position and didn't search with the secondary option. When on your team they can then be played anywhere. For my team, I can play Hornsby at any of the positions he is eligible to play at, but if he wasn't primary at second then I couldn't have drafted him. In 1919 he was primary at 3rd, so if we started then, I couldn't draft him for the MIF.