See, this discussion comes up often and I disagree. Assuming it is a hyper, Thorpe Park want it to "market itself", and for that they require it to dominate the park's skyline, as a hyper's height is its main USP. Stealth's main USP is, for me, its launch, which would still probably be the most forceful thing at the park.
Regarding it "towering over Stealth", I've never considered this to be an issue, as it depends where the ride's lift hill is. If the lift hill is immediately behind Stealth but is, say, 250ft tall, then it will somewhat dwarf Stealth (although what with Thorpe Park being so compact, it will still be very clear that Stealth is tall due to it being next to The Swarm, Tidal Wave etc). But, if you put the station and lift hill on the Loggers site, then had the majority of the ride's airtime hills along the back of the park, I fail to see the issue. With the exception of Saw, the Loggers site is possibly one of the most secluded spots to place the lift hill, thus reducing the extent to which it dwarfs other rides. Additionally, when looking out from the main entrance (and from most of the areas of the park from which Stealth is visible), a coaster taller than Stealth would not look so tall due to it being so much further away from the person.
I don't really understand the argument that a taller hyper would diminish Stealth, because even if you stood Mako next to Stealth, Stealth becomes far less intimidating. It's all about positioning and perspective. Thorpe can definitely pull off 230ft+ if place correctly and I'd love to see them try.