What determines the level of new heros?

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In particular, when I use Wes' ability to trigger a hero behind the next door, I've seen a level 2 hero appear when my other heros are level 8, which is... useless. What determines the level of the hero? Is it different than heros that appear naturally?
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How do you level up fast in villagers and heroes?
Killing bosses is considered to be the fastest way to level. Each boss gives you a first-kill XP-bonus. This means the basic xp you would get is multiplied. It can be very rewarding to activate a hero-xp-booster when you are about to run a zone for the first time.How do you level up heroes in Fire Emblem heroes?
Heroes can only gain 1 Level Up at a time from killing a single enemy....Ways To Get XP Bonuses:How do you level up heroes in empires and puzzles?
Go to your Hero Roster by pressing Heroes icon at the bottom of your screen. Select a Hero from the Hero Roster. Press \u201cLevel Up\u201d.How do you level up in puzzle combat?
How do I level up my Heroes?Level 5 HEROES with ABILITY and PETS VS Max HEROES | Clash of Clans
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Images: Mikhail Nilov, Thirdman, Erik Mclean, Max Vakhtbovych