一緒に「くもうな」

Hello there again guys,

Recently I've stumbled into an expression, whose meaning is a little bit nebulous to me.

Its part of captain' tsubasa's famous manga,

The kids just recovered their training grounds, and they are planning to begin the practice sessions

石崎「ニュー南葛小 サッカー部の初練習開始だ」
「ランニングの次は対人パスだ」

「つばさくん、一緒にくもうな」

つばさ「うん」

the bolded part is bugging me right now, the question are.

1 - This is surely the volitional shape of a verb, and its probably "くむ", but there is probably an idiom behind this sentence, and the lack of kanji makes me lost here, what is the intended meaning of this sentence?

2 - the volitional followed by な、is this an imperative-volitional, or just a good old "な", like the one in "凄いなー", and "いい湯だな"


Thank you for the attention guys

1)
That's 組む.

2)
The former. It's close to よ.

So, it means something around the lines of "Tsubasa, lets group up together" ??

Thank you again Toritori!!