Each block satisfies the equation
Σ outputs - Σ inputs = Σ kernel + offset * G + 60e9 * H
which can be seen is a small variation on the equation for the entire transaction history [1], which has no inputs and the UTXO set as outputs.
No; they’re all Pedersen commitments, but only the kernels are represented as public keys, because they are Pedersen commitments to a zero value.
Correct. It would be nice if they’re shown just like inputs and outputs are.
[1] Oneliner Grin: Σ utxo = Σ kernel + offset * G + height * 60 * H