We've been through this exercise:
Almiron
Piatti
Valeri
Klejstan
Higuain
Vazquez
Lodeiro
Feilhaber
Acosta
Diaz (when healthy)
Rusnak
Thats 11 players that provide more than Maxi. I would argue Lee Nguyen and Kelyn Rowe are right there too. Kaka is now retired but wouldn't fit our team anyway.
If you called Atlanta, Montreal, Portland, Columbus, Toronto, NJRB, RSL or Seattle and offered Maxi straight up for their guy, they laugh at you.
Maybe DC considers Acosta. SKC maybe considers Feilhaber because of his contract situation. Diaz was MLS Best XI in 2016 but he only has one Achilles.