Dandy
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Regarding the generation of weeks and monsters—this rule is specifically prohibited in tournaments, including online ones, and is completely locked down in hd+. That's why we use either restoration in SoD SP or play without hd+. As for an army arriving with a hero—that's a normal working strategy; that's exactly why people fight over the miner, Valeska, or the dragon in online games. I don't actually recall there being any fundamental objections to starting troops on heroes (with the exception of Legend, where all heroes arrived with one-hit kills, and a clunky fix for which now affects starting move points). Moreover, the scale of free troops isn't imbalanced like the geometric progression of monster months, nor is it as high as +5 high-tier troops, but it's not so small that the game becomes boring—it's B-balance.
Added after 10 minutes
In general, I'm starting to lean toward the idea that a bug is indeed a bug. But on this specific map, the influence on gameplay and the more unfair tactic is precisely the monster month.
without using either the bug or the monster month* the map can still be completed,
but by using only the bug, even most effectively—you shave off about one month from the walkthrough
while using only the monster month—you shave off 3-4-5 months
so which of these tactics is more imbalanced?)
Added after 10 minutes
In general, I'm starting to lean toward the idea that a bug is indeed a bug. But on this specific map, the influence on gameplay and the more unfair tactic is precisely the monster month.
without using either the bug or the monster month* the map can still be completed,
but by using only the bug, even most effectively—you shave off about one month from the walkthrough
while using only the monster month—you shave off 3-4-5 months
so which of these tactics is more imbalanced?)