For start I will repeat that I don't think any of these 5 are a clear number 1 candidate, which is why we are talking about it in the first place.

Anyway out of these Latvala, Meeke and Evans all already were or are (Evans) number 1 driver and only Latvala was really in a title fight. But that year (2017) also showed that the consistency (in speed) wasn't still there, nobody knows how much was that due to the car just not being fast on some rallies and how much was the driver. At that time people most thought it was the car, but last two years showed that it could also have been the driver. (compare tarmac speed on Corsica this year with Tanak and Meeke vs Latvala for example).

Mikkelsen has never been n1, but historically his main problem is that he lacks the last 1/10 of speed to win by. Which is important when win gives 7 more points than 2nd place.

Evans looks like a very good n2 to have in any team to me, but doesn't have consistent speed on more rallies, even though he can win on a few. Note that he is 1 year older than Mikkelsen and basically same number of full season WRC drives.

Obviously it's too early for Suninen to be n1, but maybe the season after. Clearly not a good idea to have something like Suninen + Rovanpera+Katsuta (at Toyota) or Suninen+Greensmith+Tidemand/Paddon (at MSport), those combination just simply lack the experience needed when things are not working perfectly. (see Finland this year)