What's stupid about that? If what previous person said about Santa doubling his girl's stats is true (and looking at 5th battle requirement, it seems true), that's exactly what we will get at 15th battle.
1st - 6.3k/6.3k/6.5k
...
5th - 100.8k/100.8k/105.6k
...
15th - 103.2M/103.2M/108.1M