The reason I think Parrott is like Kane is partly build (height, size), partly pace (lack of), partly that he can play as a 9 or 10 and party that he's very composed and unruffled with a great touch. I think thats more similar to Kane than Keane personally. A lot of people used to think that Keane was a no 10 but he really wasn't - his creativity and passing was bang average and not remotely close to Kane's passing. Its just that Keane was very busy and harried defenders into mistakes.
Yes, I have seen yesterday's goals. I don't know Scarlett's height but he looks like say 5 foot 9 (say) to me. Hard shot as you say, like Defoe, and powerful for his size, like Defoe. Perhaps (washing my mouth out) Ian Wright might be as good as a comparison as Defoe. I wouldnt use Haaland as a comp though as I think Scarlett is quicker, better acceleration (like Wright) and Haaland is 6 foot 4!!!