By Nick Selbe While blockbuster trades stole the show, which subtle moves will prove most significant for teams either looking for a playoff push or total rebuild? Welcome to The Opener, where every weekday morning during the regular season you’ll get a fresh, topical story to start your day from one of SI.com’s MLB writers. The timing of Tuesday’s monumental trade of Juan Soto to the Padres was, to the neutral baseball observer, both a blessing and a curse. The deal went down (at least in principle, try as Eric Hosmer might to delay it) early enough that we weren’t forced to wait on pins and …