Agree it's long, disagree we have a whole new team. The pitching and defense have been there from the beginning of the season and are the heart of this team's success. Breslow has added two good bats, but both are on the IL. Instead, we have seen Contreras's OPS stay over .900 all season long, Rafaela improve at the plate, Abreu up and down at the plate, Durbin, decent at the plate, Duran (despite an OPS of .602) having the 4th most total bases, tied for 2d in rbi's, and just 5th in runs scored. Monasterio stunk through June and went lights out in July (OPS 1.044). All 6 of those players have been together all season. So have Yoshida, Wong, and Narvaez.
Do I think this team has morphed from also ran to definitely in the hunt? Absolutely. Someone else said their secret is old fashioned baseball--solid pitching and defense and some hitting enhanced by bunts and good hitting with RISP. They are doing this without their two best players from last year--Crochet and Anthony--who have both been on the IL for 3 or more months.
And who gets the lion's share of the credit for this metamorphosis? Breslow.