Extra Tips for Yellowing Leaf Neo?

[alecStewart1]

Hey gang,

I noticed this guy, Myeonggwanggae, had two leaves that were turning yellow kind of out of the blue.
It seems to be staying at those two leaves. At first I thought it was just naturally losing leaves, but something didn't feel right whenever I saw the leaf above the one at the base start to turn yellow-ish.

A few things I suspect as to why this is:

1. This guy was in a bark mix, and was moved to a moss mound
2. I forgot to apply fungicide to a root that cracked a little whenever I was making the mound.
3. The plant was getting a lot more direct sunlight than it should've been, the side where those leaves are were getting hit the most before I moved the rack.

I double checked the moss mound and it still had that pocket for air, so that probably wasn't the cause.

In the pictures you'll see I soaked it in a water and sulfur fungicide solution for a little bit (15 minutes), this morning I sprayed him with some BioAdvanced Houseplant 3-in-1 (it contains sulfur and some other compound that I can't remember the name of that starts with "Py") and I'm keeping it bare root to try and dry out out any potential fungus.

I have some Thiomyl Systemic Fungicide, a copper based fungicide, and Ceylon Cinnamon Leaf Oil from Ray coming in that I meant to get before now, but at least I got bought it now (thanks for shipping those out so quickly by the way, Ray).

Should I continue the treatments with sulfur and monitor the plant before I use anything more advanced?