That would be interesting. I was thinking perhaps a set of explosive bolts on the landing legs which punched into the deck once it was stable.
I was also quite pleased that they had solid video of it coming into land with a drone that was hovering off barge. That was a brilliant move on SpaceX's part.
In the new field of vtoL rocketry, you want to have as much of the landing gear as possible on the pad and as little as possible on the rocket. An expensive array of mass produced "autograpples" embedded in the platform would be preferable over any solution that adds mass to the rocket.
I was also quite pleased that they had solid video of it coming into land with a drone that was hovering off barge. That was a brilliant move on SpaceX's part.