Complete nothingburger. What military capability do the Baltic states bring? Isolated geographical position, small countries with small armies and small economies.
So it’s not a factor in the first place. But even if it was, Ukraine handily outranks Poland when it comes to providing capability. They have an extensive (largely state-owned btw) arms industry, very capable engineers, and, in case you haven’t noticed, fighting spirit.
Last but not least they’re punching above their weight in Eurovision. Oh wait that was EU accession, not NATO.