New heros and a balancing solution for them

New heros would be cool but it would quickly overpower attacks and overcrowd bases. Heres my solution (ignore the list of heros they are not my suggestion i just need examples)

5 heros
Barbarian King
Archer Queen
Dragon
Wizard
skeleton

Defensive:
Instead of having the units unusable for an hour after they are defeated, hero's pad is "broken" for that hour rendering it unusable to host a hero.

Offensive:
instead of deploying a hero, you deploy a spawn pad, similar to the clan castle drop, that deploys the selected hero. Also has the same cool down as defensive.

Using/choosing/preventing game breaking:
You still only have two available heros to defend and attack with, so your given two hero pads. Looking at the hero pads in your base, you would have another option to select the hero you want to use there, (queen, king, drag ect.) and it will still have the same options, defend/not defend. Since there are multiple heroes, the offense pads and deffense pads are different, for example your defense hero pads are broke but you can still use your offense pads and vice versa. Heroes defeated still have the same heal times though (king is defeated defensivly and is healing for 1 hour, you can not use him offensivly until he is healed.)

Opinions? suggestions? likes or dislikes? (reminder, i am not suggesting new heroes but a way to add more heroes, i dont have any ideas for dragon, wizard, or skeleton heroes and those topics should be on a new thread)