Arizona Diamondbacks veteran first baseman Carlos Santana is in the midst of a minor league rehab assignment as he progresses from an adductor strain . Sooner than later, he'll be healthy enough to return to the D-backs' big league club from the Injured List. And when he does, Arizona will suddenly be facing a major playing-time dilemma in their infield. Carlos Santana's D-backs return may cause infield logjam Diamondbacks first baseman Carlos Santana (41) looks to the outfield during a spring training game against the Brewers at Salt River Fields on March 20, 2026. | Patrick Breen/The Republic / USA TODAY NETWORK via Imagn Images Santana, 40, had not been an effective hitter for Arizona, though he only appeared in eight games. Still, a .083/.154/.125 slash is quite lacking for the production the D-backs needed at the first base position. The veteran was not brought in to provide much slug, and was mainly targeted for his ability to play solid defense.…