solo poly partners showing up to play with established LS couples — does this ever actually work

so we've been chatting with a guy on a hinge-ENM filter (mid 30s, very articulate, solopoly identifying, lives alone, has 2 other partners, no kids no nesting partner) and the more we talk the more i wonder if this is a good match or a recipe for friction. context, we're F35 M38, classic LS couple, married 8 yrs, no kids yet but they're on the way (im 12 weeks). we've played as a couple a fair bit, sometimes ive played solo with one or two trusted male friends with dh's consent, never had a regular thing with anyone outside the marriage. we've been thinking about a recurring MFM dynamic and this guy is the first real candidate. but here's where i pause. solopoly as a framework values autonomy, no hierarchy, equal treatment of all partners. our framework is the opposite, were a unit, dh comes first, anyone playing with us is playing with the unit. those two philosophies are gonna meet somewhere and i wanna know where ppl have seen this go wrong. things i think might be friction. he expects to be treated as a "partner" not a "play partner" and those are different words with different expectations. also if we have a calendar conflict im going to choose dh's plans 100% of the time which is gonna read as "lesser" to a solopoly framework. oh and holidays, birthdays, illness — solopoly ppl often want to be available for those things and we wouldn't invite him. has anyone here actually run a sustained dynamic with a solopoly person while running classic couple-first LS values. did the philosophies clash or did clear talking fix it. or did it just slowly fail and you stopped texting.