"They're not completely out of the picture, but I don't know who I'll be playing for, and that's a huge factor," Mister said.
When the Cyclones announced the firings of offensive coordinator Courtney Messingham and running backs coach Kenith Pope on Dec. 1, Mister was hopeful he'd find out soon the future direction of the offense.
Mister said in an early-December in-home visit with Iowa State, head coach Paul Rhoads intimated a decision might be coming soon, but Mister recently learned it could be until mid-January.
"That was a bummer," Mister said.
While Mister coped with the departure of Pope, who he liked very much, a relationship to Indiana running backs coach Deland McCullough looked better and better by the day.
McCullough and Indiana head coach Kevin Wilson visited Mister on an in-home visit and then had him to campus for an official.
Mister said Indiana is now in the lead for his services and he's comfortable with the coaching staff, pointing out McCullough has been recruiting Mister since his sophomore season.
A previously-planned Jan. 24 visit to Ames is now up in the air. Rhoads told Mister's parents on Thursday, when they called to let him know Tommy would decommit, that the Cyclones still wanted to recruit him.
Mister said he could be swayed back to Iowa State if the Cyclones hire an "all-around stud" to coach the running backs.
"Somebody whose system I like and who has put people in the NFL," said Mister, who has long maintained he wants to play in a downhill running scheme and get touches in the passing game.
"I loved the school, they did an awesome job recruiting me, but I don't know who I'll be playing for," he said.
Mister said he would like to decide on a school by mid to late January, the timing of which complicates a planned official visit but does fall in line with Iowa State's plans to announce a handful of offensive hires.
"I want to have my heart set on a school before I head off to the USA Football game," Mister, a 2014 Under-19 team member, said.
Team USA plays team Canada on Feb. 7 in Arlington, Texas, two days after National Signing Day.
Mister rushed for over 1,700 yards and 30 touchdowns for St. Rita, which went 12-2.
The Cyclones now have one running back in the 2014 class, Martinez Syria.