It's a lot generous. Shai was a fulltime rotation level player the day he stepped on an NBA court. He was a 6th/7th man on a 48 win team that did a bit of everything and did it pretty well. Ja'Kobe has been a deeeep bench level player, one of the most ineffient guards in the league, on a high lottery team. If Ja'Kobe was on anything but a high lottery team, he would be in the G League right now, he's nowhere near good enough to be a NBA player yet.
I don't see the similarities at all. Shai was an efficient plus plus 3 level scorer on top of being a very good playmaker and impact NCAA defender as a prospect. Walter a low efficiency, high volume shooting guard with severe tunnel vision. Not close to the same level of prospect coming into the NBA, and not close to the same level of quality in year 1.
Even just taking a look at his best game of the year:
View: https://www.youtube.com/watch?v=wSoO7gHmgGI
It's mostly catch and shoot stuff that drops for him, a few flashes of being able to make a good pass to the cutter off the dribble, one "kinda like Shai if you squint a bit" drive when he attacks a close out.
There is a huge, huge defining factor when determining stylistic similarity to someone like Shai....are they able to create off of the dribble? If you're not able to attack and break down a defence off of the dribble consistently, you're not stylistically similar to any of the perimeter offensive engines like Shai, Lebron, Spider, Giannis, Steph, Dame, Brunson, Tatum, Ant, etc. If you can't do that, your coach isn't even going to put you in the type of role where you're taking those type of shots. Aside from a few isolated flashes, I haven't seen much from Ja'Kobe this year that suggests that he's going to end up an on ball player.