I've talked a little about him...
Tall, strong, fairly quick for his size, looks very mature for his age, very good mentality (no laziness nor big heading), good technique, solid, not mistake prone. His positioning is yet to be judged better, but looks at least decent and this can be improved with time. He just turned 18 and played in a high level here in the Brazilian league. The team he played in was top 7 here.
In few words, worthwhile 5M investment (that's what they say Botafogo wants for him). But players in Brazil are getting more and more expensive, so I'd say Botafogo will only sell for 7 or 8M. IMO also worthwhile. IMO he's capable of coming straight to the squad, doesn't need to be loaned out. And his ceilling is hard to tell. Could be huge.
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Oh and if he's not sold right now, in one year he'll be worth around 10-12M I guess.