You can bank points as many times as you want as long as you do the banking before the end of the eighth month of your use year, and doing a transfer has no impact on that rule. However, you are allowed only one transfer per use year, in or out, but not both.
Thus, you cannot have two different members transfer points to you in the same use year. However, it is possible to actually do two transfers around the same time, as long as the second transfer is to a different use year from the first, and you are allowed, at any given point in time to do a transfer to your current use year and another one for your next use year. Moreover, transferred points can be borrowed when making a reservation. Example:
Assume you have a Feb use year and want to take a trip in May 2027. In March 2026, you can have someone transfer to you their Dec 2026 use year points and that would count as a transfer to your Feb 2026 use year. On the same day, you could have someone else transfer to you March 2027 points and that would count as a transfer to your Feb 2027 use year. You could then bank your Feb 2026 points. Result: you would have those banked points, plus your Feb 2027 points, plus the transferred Dec 2026 points, plus the transferred March 2027 points, and could use them all to reserve a stay in May 2027, either at 11-months out from your desired arrival date, if all the points are for the same
DVC Resort, or 7-months out if the points are not from the same DVC Resort..