true coura, monitors are solitary creatures that do prefer to be left alone, but they are smart and adapt to social interaction with humans. unpredictability is a problem with all reptiles and will only be worsened if he is treated like hes expected to bite
Im not saying it should treat the lizard like a tiger but hell that is a animal that must be respected considering the kind of waponery it has on its mouth. This is still for all means a wild monitor that was raised by humans, You cant expect him to become like totaly tame

It has to be a limbo. On other hand unpredictability is defenetly bigger on this guys simply because they are so smart. Once I get my igs out of their cages I know i can trust them but I dont know if I would trust one of this guys

All animals can bite, but this have the potencial to do serious damage. On the other hand handling can have a oposite efect turning the animals wilder because they dont like it. But if the lizard "likes" it, interacion can be given and its desirable. But it has to be allways present the knowlege that this a predator lizard from a harsh evoirement and should be treated with the upmost respect as well as reading its body language. On the other hand this guys are great for training and he should teach him a few simple tricks for both safety.
. touching their head is not seen as a threat until its forsful or unrelenting, just like most animals. touching his head for him is not like eye contact with a dog, he will trust it until there's a reason not to.
Both can be seen as chalange, but really depends on the lizard. Some adult male igs dont like both eye contact or toching their heads. My big girl doesant like it either

The thing here is that in case the lizard doesant likes it, he only has a fracsion of a secont to take the hand of in case he decides to bite. Untill otherwise its proven this is still a questionable temperament one. He still has to find its likes and dislikes wich will apear as its personality unfolds. Maybe the head is to be toched or maybe its of limits. The lizard will tell.
i know the two lizards are very different but there are some similarities in all monitors. when i got my sav 3 months he would hiss, whip, bite and even lunge at me to try and bite. from handling him all the time and touching him all the time i can touch him anywhere and he will crawl right onto my lap and push his head into my hand to get me to scratch him, like a cat. this guy demands respect but that doesn't mean you need to be scared of him nor does it mean he can't be a pet.
Rigth but dont forget the kind of power it has, that on its own means that it has to be respected. I also think a litle healty amount of fear aint bad either, that will keep him safe. Good jugement is also important. Dont forget thouse 2 animals personality is diferent. Even with savs some aparently remain beasts from hell (even if I never saw a agressive one)
monitors are definitely the kings of glare. when mine is basking and doesn't want to be muffed with he will burn a whole through my eyes with his stare. i love it though cause he looks into my eyes when he does it and not at the hand that is reaching for him.
don't take this as "how do you know what youre talking about?", i'm just curious. do you have any monitors coura?
I dont have monitors, my big lizard thing its iguanas

(also my mom doesant like the fact that they hand snake like tongues, go figure

) I do however look foward into getting me some ackies in the future. Back to topic, but I do have monitor contact. One of my best friends (now its studing in spain) has a true cb female sav that is completly tame. Now I kind of look at her because she´s living at he´s mom´s place after he´s room mates decided they no longer wanted a lizard pooping on the bathroom floor

so he bring her back, and I come over several times a mouth to see how she is doing. Its family has several times kind of asked me if i dont want her

but I refused, its a nice home and electricity aint cheap

Aside from her I several times adivised people with monitors, mainly savs but also niles

(notice that here its rare for people to have things like ackies and trees)