Why not? It would have been a brilliant strategy to avoid the postconviction relief petition complaining that Nurmi provided ineffective assistance of counsel by failing to subpoena the witnesses.
I thought it was a brilliant move as well, I keep checking the docket for any sign of subpoena activity, so far the only thing posted today was a 'Supplemental Noitce of Witness For Penalty Phase' but as usual, can't tell who filed it.