What’s so good in BT8 that helps Jesmon so much in BT8?
Firstly BT8-001 Gurimon , this card alone helps with the lack of draw power Jesmon has and Jesmon decks reliance on BT6 Sistermon Blancs for draw power.
Secondly BT8-084 Kimeramon, this card helps with so much more in Jesmon decks you can either Jogress 2 Sistemon Noirs or you could Jogress a red lvl 4 and one Noir and just digivolve into a lvl 5 Kimeramon and put a lvl 5 below Kimeramon's digivolution sure (usually either a ST1 Greymon or whatever is good in the situation).
What I personally do is to prepare as much as I can by digivolving into Jesmon in raising area while building the board with red memory boosts or Analog Boy to get certain cards in hand and as well as too fill the trash with Sistermons so that Jesmon could easily revive them later to end it in one swift turn.