Here's why:
* Contact is a specific effect of the "Contact" archetype. These monsters gain a special effect when they attack directly.
* Gladiator Beasts are a different archetype with their own unique effects. They focus on summoning from the hand and gaining advantage through battle and their special summoning conditions.
To use Contact monsters effectively, you would need to build a deck specifically around them. These decks often revolve around monsters like "Contact "C" or "Contact "D" and use the "Contact" spell cards to support their strategies.
While Gladiator Beasts are a strong archetype, they don't have any inherent synergy with Contact monsters. Therefore, you wouldn't be able to "contact" with them.