Leads to do things like gancho or cross while in a lean are different from the leads to the same steps when the follower is upright. The lead has to be extremely subtle because anything bigger will tip the follower off the leader.

For Leaders: As the lead gets smaller, it has to be very clear, without what we call "noise" (excess movements that aren't directly related to what you mean to lead).

For Followers: Following steps you already know when you're not vertical requires that you be stronger in your center so it is easier to connect your body to whatever the leader is asking. You need to learn to really listen for the subtlety of his lead.

This is an extreme example of what we say about tango: the leader asks a little and the follower gives him a lot.