Long story short, my PI decided to get ANOTHER undergrad next semester and he has already committed to the student (another sophomore). Anyways, it sounded like this new incoming undergrad student is actually for another grad student and not for me (thank goodness). and that "another" grad student also made it very obvious that he doesn't want/need anymore undergrad assistant.
So now we have 4 grad students, 2 volunteers (1 undergrad, 1 postgrad), and 3 undergrads, for a total of 9 people in the group. As for right now, I have 1 undergrad and 1 volunteer working with me, and both of them are gonna be gone by this Friday and won't be back for another 5 weeks