It's hard to say if Steath's RB ability is his only one or not. The host did "no comment" on the question asking what exactly we can track or what we tracked. It is unclear if we would've seen more than one visit if he used more than one ability.
Right now Rachyl is a good lynch in my mind because she's quiet about her ability, has not been contributing and there's the possibility that she's holding the grail (possibly not though if all she said is that she holds a strange artifact).
When it comes to wido we're still unsure of what the items do that wido gives out. It sounds like a possible Merlin ability if you ask me. But it's always a matter of how many abilities one role can possibly execute.
Like Voss' architect chat that I could also see as being part of Morgan's kit: Would Morgan be able to use both chat and NK at the same time?
It's really hard to judge this. We need more feedback from abilities if you ask me. Especially on what some of those do because that could help even more in figuring out which ability is part of which role's kit.
So today I would actually propose the Rachyl lynch as a relatively safe lynch for us.