I think its said "you MIGHT be matched with a player who has a LOWER level than your"

p.s. and lower level doenst mean lower power

No, because that way you would almost never get 5 wins, unless you really own a wide assortment of ninjas and very likely you would be always compelled in using 150 revival potions (how many times happens within two meta teams of comparable power that you don't lose any ninja even if you win?)

The only way to solve the issue would be to change the script and add the rule that if you lost your previous match you can't be matched with somebody an higher or comparable level to yours unless you too wait over 60 seconds.