Checkdown tree works different, IMO, than the general perception by the community, though. You set a LB to cover HB -> FB -> blitz. If there is no HB/FB in play (5WR for example) the LB will not blitz but revert to a default zone. Or if you set a LB m2m on FB -> blitz and it's a 3WR no FB, then the LB will not blitz but default to zone since there is no FB on field. The only time he will checkdown to a blitz is when a FB is in play and stays in to block. It's a pretty big distinction to account for when creating DPC plays, TBH.
Least that's how I understood it to work...
Least that's how I understood it to work...