First of all Obi is not a vested veteran (i.e. someone with four accrued seasons) otherwise he would not be eligible for the practice squad. So his salary didn't become guaranteed in W1. It was purely a choice by the team to pay him that and not PS minimum.
Also it seems like Reiss and Obi both disagree with your opinion:
via his usual Sunday column (
Patriots' unheralded OL Joe Thuney has rare versatility).
Which more or less reads to me like Reiss saying
as soon as Cannon is ready to play there will be a transaction that moves Obi onto the active roster.
Also an obligatory wave to resident Obi Fan
@patfanken to make him aware of Reiss' final sentence.