Hoya kerrii Is a big growing plant - that little stem may grow for a year and gain another 8 ft before its done. In my experience, first it will grow a long bare stem, then peduncles will grow from the stem and eventually leaves. Hoya don't really twine, you will have to do that. They grip porous things like tree trunks (or in my case, the stucco on my house wall) with those tiny roots along the stems. If you look at Lin's photos closely, you will see she has twined the stems back into and around the plant. What she has done is really the easiest way to keep them unless you have a huge wall to give over to your Hoya.
What size pot is your Hoya in? If its a 6 inch pot, leave it but if something smaller, think about an up-pot while you can still handle it. I don't know what size pot Lin's are in but my largest is 6 inches. As Hoya are epiphytic, the pot and growing medium is more for support so doesn't have to grow with the plant.
The original leaf may yellow and die now that its decided to be a real plant.
