It’s normal if he instantly reply, it shows he appreciate you and respect you. This is odd that you like that type of guys that leave you hanging for days till you get a reply. But maybe you should give it a try with that dude.
Some people are different irl than on texts. Some people talk a lot on texts and are quiet irl. Some talk less on texts and they blow your head irl. It’s just normal. If you’re planning to go on date, then make it for yourself so you’d get to know him more.
If you liked it, keep going with the conversation. If not, then try to be nice and tell him in a nice way.
Oh btw, pretty sure whenever you get a dude, you’ll find bad things you’d dislike about him. But it isn’t about the good things, it’s about are you able to handle these bad traits? If yes, then it might work. If not, then it won’t work and it’s better to end it asap.