Would Blackrock just buy Grayscale?

So with this sudden rush to get ETFs approved and a desire to acquire bitcoin, would it make sense for Blackrock to just write a check for Grayscale atop whatever holdings they already have? Or is it really as simple are Blackrock just going to Coinbase and saying put X amount Bitcoin into our custodial prime account or whatever? Would Blackrock self custody? A-lot of interesting questions here… I understand how individuals can buy and sell but with corporations things are seemingly a bit more black box and I ponder how these sorts of large acquisitions of the asset happen?