The answer is shooting.
I really think the Jazz's biggest weakness is guarding elite SFs man-to-man because we just lack a strong, sufficiently athletic, sufficiently big wing to handle the Lebrons, Kawhis, Paul Georges, and with any luck, Durants of the league. So I think it behoove them to get a commensurate physical specimen in the bullpen and get them ready for when their number might be called.
OPJ would be a dream, even with his injury problems, but I think RHJ is a worthy bet. Maybe they should just groom Brantley for that role and see if they can get him to calm down and settle into playing the 3nD role.