The symbolism is the parallels between Oden and Zoro, both swordsman, Zoro leaving a scar on Kaido using Enma is symbolic, nothing bigger than that, a scar doesn't wins wars or defeats enemies.
Kidd thanked Zoro for holding up the attack atleast for 1 second, enough time for everyone to react, and for Law to teleport Zoro.
EOS Sanji may not be dumb enough to try to block an attack like that, especially because ANYONE is supposed to block that without getting killed or heavily injured. What Zoro did was a sacrifice. If you can't feel that reading 1009 and 1010, then there is nothing much to say.
Law didn't said anything, he just realized Zoro took too much damage on trying to hold the attack, enough damage to put him out the fight completely.