Working with a co-facilitator can be challenging. When you present alone, you are actively in control of the flow, timing, and dynamics of the presentation. When you co-facilitate, you also must be reactive to what your dance partner, your co-facilitator, says and does.
The situation is like what "Dancing with the Stars" contestants’ experience. You may be able to move quite effectively on your own, but unless you can work in partnership, your team will not win.