what was your take-away from that? This is also how I came to see the value of hand open. We were doing static pushes and it was fairly obvious which was the stronger of the two.
If you subscribe to Mike Sigmans suit model, spreading the fingers engages more of the suit, rather than just more musclar tension.
For stuff like this, I say just try it out rather than speculate, in particular as this doesnt seem to require lots of conditioning.