The hard-play style will always summon digimon by playing directly, it takes much more cost than digivolve. But that is the strategy, each of them has their own role to achieve the success of the plan. All these cards has 4 of them in the deck, that is the reason why <Draw+1> is a must. The LV5 [BT2-077] Kimeramon, [BT2-018] Volcanicdramon and [BT2-030] Metalsedramon, they are all able to destroy opponent digimons directly once "played". The Red [BT2-018] Volcanicdramon is popular for avoiding Rookie-Rush play in the game. Because you are giving opponent too much memories when you hard-play, so this card is very important for the deck.
Once the LV6 [BT2-030] Metalseadramon got summoned, next we can digivolve it to [BT1-084] Omnimon. By digivolving this digimon, it also destroys one of opponent's digimon. Not only that, you can return the LV6 Metalseadramon back to your hand (when attacking), this digimon becomes active, his 15000DP makes him hard to be killed when checking security (except for some option cards that can destroy him)
Now talking about the scenario when the opponent sweep out many security cards, putting the [BT2-039] Magnadramon to back-up the loss seems a good idea, it recovers up to 2 security cards.