
This dude looks to me much better for a seeker than a guardian, for several reasons.
- The +1 will likely be wasted on many guardians, while a seeker with Acidic Ichor will appreciate to fight with 7, rather than 6.
- He offers unpaired soak for the class, that is generally on the squishier side. He should particularly well synergize with Miskatonic Archaeology Funding, because he is not Miskatonic, which makes him a good pick for the single natural Ally slot, every investigator comes with. (In particular, if you don't plan on taking Mr. "Rook" or Charles Ross, Esq.)
- He is easy to fill up with evidence for a seeker. Much harder for most guardians, even with his buff. They will likely have to pay through the nose on Keen Eye to get anywhere, which does not appeal to me, given how resource hungry guardians are. The one Guardian who would particularly appreciate the can't take Michael, while Sister Mary could get away with some Mystic Investigate-spells, but is not that interested in either stat-boost.
- He costs a lot of XP. You will probably not get your second copy until late in the campaign. Seekers are the class to easier get away with that, consistency wise.
Of course, you need to build a flex seeker like Joe Diamond to get full value. I'm imaging him very strong with Amanda Sharpe. The downside of him is that he exhausts, if you use his evidence. This makes power turns to vitriolise bosses with Vicious Blow (2) below her less efficient. Still, I'm very eager to try out this combo.