Socializing my Toddler

Long post, please bare with me, I appreciate you taking the time to read.

Let me start by saying, my son is very social. He loves playing with other kids and very talkative. We just keep running into this small “issue” and I’m not sure what or even if I should do anything about it.

My son is 2.5 years old. Baby sister is on the way. I’m a SAHM and he’s never been in childcare. I have a handful of friends that have kids close to his age (between 1.5yrs and 4.5yrs) and we try to get together often so the kids can play. The ones closest to his age are 2 and 3. He has a hard time playing with them because he is pretty advanced for his age. (We practice Montessori Lifestyle, so I think that has a lot to do with it.) The other kids behavior skills and language skills are 100% developmentally appropriate for their age, my son is just advanced. When watching them play I often notice him trying to teach his friends how to play with things- or he’ll observe how they are playing and change how he would do whatever it is, so he can play with them the way they do, or he’ll just ask me to play instead because they’re too (for lack of better word) babyish to him. When he is with older kids, (which he seems to prefer) he is often too little and they don’t understand what he’s saying or don’t want to play with him because he’s “a baby”, and then he ends up playing by himself.

I want him to be able to play with someone that is at the same level of development as him, I hate him feeling bored or left out because he’s always either too advanced or not advanced enough. My husband and I always say to each other he needed an older sibling. Lol.

Will this effect his social skills when he enters school? What should I do?