Why would Kathril, Aspect Warper's ability grant multiple hexproof counters?
Kathril will create a separate counter for each variant of hexproof creatures in your graveyard have. In the same vein, Odric will give your creatures each variant of hexproof a creature you control have.
The reason Kathril, Odric and cards similar to them work the way they do is because of the following rule:

702.1c. An effect may state that &quot;the same is true for&quot; a list of keyword abilities or similar. If one of those keyword abilities has variants or variables and the effect grants that keyword or counters of that keyword to one or more objects and/or players, it grants each appropriate variant and variable of that keyword.

Add to that the rule saying

702.11d. &quot;Hexproof from [quality]&quot; is a variant of the hexproof ability [...]

and we see why Kathril gives &quot;hexproof from&quot; counters and Odric gives &quot;hexproof from&quot; to creatures. If we look at the definition of landwalk,

702.14a. Landwalk is a generic term that appears within an object's rules text as &quot;[type]walk,&quot; where [type] is usually a subtype, but can be the card type land, any land type, any supertype, or any combination thereof.

I think you'll agree that plainswalk, islandwalk etc. are variants of landwalk, and thus Cairn Wanderer gains all that are present (with the same reasoning used for protection).