With the reveal that LM03 will be coming out in December, I had ro re-work the Gallantmon list a little bit.
I decided to focus on the new BT17 Gallantmon as the main Top End card, to warp into him, either through the BT17 Takato or the ST7 Guilmon (although you lose a lot of power with the inherited effects), since he really seems like the best lvl 6 that we have (pop 8k or less, up to 12k with the BT17 Guilmon and Growlmon, DP boost and Blocker if nothing gets deleted, immune to effects, plus the DP boost and blocker stay for opponents turn to Blast into Crimson Mode and unsuspend with BT17 WarGrowlmon)
The new Takato is amazing, one of the best cards in the deck, spawning a lvl 6 for no digivolve memory, and then either giving you either another swing or a blocker, who either way will be a body to Blast into Crimson is insane. Plus if you're careful enough with the memory, you can set it up so you pass back around to yourself with the BT12 WarGrowlmon.
The new Gallantmon is a very good Tier 2 deck, blocking off any lower Tier decks from being higher by having a really good Top End, being extremly recursive, being able to, not only delete small bodies, but also large ones and a potential protection on swing, making us largely unkillable in that instant from both Sec Bombs and ACE effects. Overall it is probably one of the best Midrange decks in the meta.