Maybe, maybe not. They obviously can match any offers for Hood and Exum. But it just takes one team to give either an offer high enough that Utah probably shouldn't match.
Brooklyn may be likely to step in and muck things up.
I see Exum as the one most likely to return. The draft was PG heavy. Most teams that will have significant cap space already have better young prospects. If Hood averages 18 pts and shoots close to 40% on his 3's, I could see Brooklyn making him a big offer. Bulls could go after any of the three. Demand for Favors, of course, depends on his health.