For stalled grafts, I sometimes unwrap them about every 3 weeks to make sure there is no mold or rot. Sometimes the petioles are trying to fall off but the Parafilm or buddytape holds them in place, preventing them from falling off. These leaf petioles can start the decay process and moisture held with the scion combined with heat can germinate spores.
Your stalled scion looks pretty good. If you see yellowish condensation build up or if you see any signs of mold, you will definitely want to unwrap, spray with something like a copper soap, allow to dry and re wrap. Let us know how it goes.
Simon