Does anyone think Harry isn’t the original Merlin?

[Mira]

What about the chickens who personify “evil”?

 Yeah, everyone thinks chickens are pretty benign, scratching and clucking away peacefully, occasionally laying an egg.. However they do peck on one another, if they create a wound, they will gang up on the wounded one and peck at it till it dies...

[Talby16]

I believe Merlin built the Guardian magic atop the (pre-existing) Genus Loci spirit.
I know of no WoJ specifying/clarifying this issue... not really even any hints, alas!
 

I agree with that perspective. A confluence of ley lines should be enough to generate a Genus Loci spirit. I would hazard to guess that the creation of Demonreach and resulting power contained there would have a corrupting influence on a spirit over time. Therefore, I hypothesize that Merlin altered/bargained with/molded the original genus loci into Alfred in order to make sure it would not be corrupted and could fulfill its role as the Guardian.

[prince lotore]

I always figured that Harry was a direct descendant of merlin. We know that Ebenezer's journals go back to merlin what if the journals are passed though a family but wizards being wizards no one realizes that they were all related. We don't know who taught eb what if it was an estranged parent. Ebenezer had to learn it from someone and acts like it's the only way to protect his family

[g33k]

... A confluence of ley lines should be enough to generate a Genus Loci spirit ...

I'm pretty sure the prisoners in the well are the origin of the ley-line confluence; it's all radiating-out from them, rather than outside lines randomly "just happening" to cross there.