As someone who was playing the TCG when Gladiator beasts where introduced, and knowing the current meta in duel links I think gladiator beasts might become the next tier 0 deck. Sure, they are missing a few key cards like gyzarus, darius, rescue cat and sanmite but if Konami releases them eventually, then we are looking at the next tier 0 deck.
If they add gyzarus, which I doubt, they will have to limit the card to 1 copy, as they did with the ritual spell for the cyber angels (forgot the name of the card, sorry xD)