One of the best ways for Dream to use the favor that Technoblade owes him is using it to kill Tubbo. Breaking him out of prison is near impossible, a waste of resources and would be the destruction of a great build that could be used in the future for his own gains. Technoblade seems to still dislike Tubbo, and Tubbos snowchester is starting to look like a country more and more, so even if its a favor, there is kind of a mutual interest, with a high chance that there wont be any hard evidence pointing that it was Dream’s doing. Tommy will need Dream to resurrect Tubbo, making him depend on Dream once again. He can go back in control that way and be freed by Tommys own decision, since he will be heartbroken over the loss of his best friend and is certain that he will want him back no matter what it takes
“Jack, I’m so sorry, I swear I tried. We were so close, he just kept talking, kept talking, and talking, and then he just wandered off, and…oh my god, he was so annoying-”
“WELL YEAH BUT THAT’S THE WHOLE REASON WE WERE TRYING-”