If Haliburton stays and nobody else leaves, we're full.
I agree with your general sentiment, though -- even without Haliburton next year, I am not really sure we "need" anything in particular. I suppose it comes down to how the staff feels about only having Jackson, Walker, Bolton, Grill, and Dubar for guards (and/or possibly playing Johnson, Griffin, and Blackwell at the 3-4 spots), but that roster looks pretty full as it is, to me. Going for the best transfer, and particularly maybe a sit-one, play-one guy like Shayok that other teams are less enthused about because his tenure will be so relatively brief, as an investment in the future might make sense.
As we sit today, I agree with your assessment, there won't be many needs on the team. I doubt it will stay the same by April and there will be attrition somewhere on the roster due to player leaving to go pro, more playing time, injury or family reasons. It is just the state of College sports in this day and age.
As for who the target should be position, High School, sit out or grad transfer the staff will decide that on if/who leaves the development of the on roster replacements then. The staff has shown willingness to make hard choices and move on from those players this fall, so I have confidence they'll identify any weakness for next years team and target players from there. Also banking a scholarship and seeing if there is mid year option next year is always an option.