if he didn't this would happen
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Well to point something out if you look st what Zetsu says it is important. Sasuke tried to draw out MORE chakra when he was practically dry. Comparatively here Sasuke did not TRY to pull out more chakra.
OT: Sasuke won the fight; however, the survival was poorly done. It should have been s chidori or chidori sword stopping Deidara from blowing up.
1. Sasuke was pretty much shown and mentioned to have little if not any chakra remaining.
2. Even if he did have chakra, it was seemingly low enough to where he couldn't perform a summon (otherwise why even bother waiting for his suicide bomb, and just chidori his ass?!
3. Even if he has the chakra, can you REALLY believe the timing. He jumps into Manda and Suigetsu summons him st the perfect timing to prevent Sasuke's desth. For not planning on starting a fight, it is too much coincidence he even tells Suigetsu to summon Manda let alone summon him at the EXACT time it is needed
Which is why he should have stabbed the ball Deidara with a lightning sword and have the explosion stop. As it was mentioned, Sasuke's Ranton is superior in element, but the minute Deidara's bombs go off it is mo longer SM earth jutsu but an explosion...which lightning doesn't counter.