Isolation defense
NBA (vs) NBA2k18 (vs) NBA2k14
Spoiler tag contains more content. NBA2k14 spoiler tag contains added screenshot and 2 sets of video (Rookie and HOF isolation defense). Entire post includes screenshots, gif and video examples of isolation defense.
Even though we currently only have limited 2k18 visual gameplay without knowing about the difficulty level, I believe NBA2k14 replicates NBA isolation defense better. I ran a test run on both Rookie and Hall of Fame yesterday for NBA2k14. The difficulty level doesn't determine defensive positioning at all. And thus, I can hypothesize that the isolation defensive positioning for 2k18 (albeit a small sample size) can be found at any level, ranging from rookie to hall of fame.
NBA isolation defense
2k18 isolation defense
2k14 isolation defense
Spoiler
2k14 Screenshots (Rookie 3 Screenshots and HOF 3 Screenshots)
NBA2k14 - Rookie screenshot (isolation center, left, right) vs. defensive positioning
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Rookie isolation center - defense
Rookie isolation left - defense
Rookie isolation right - defense
NBA2k14 - HOF screenshot (isolation center, left, right) vs. defensive positioning
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HOF isolation center - defense
HOF Isolation right - defense
HOF isolation left - defense
2k14 Video Footage (Rookie 2 videos and HOF 2 videos)
NBA2k14 PS4 - Rookie 2 videos (Isolation vs defensive positioning, awareness, reaction)
NBA2k14 PS4 - HOF 2 videos (Isolation vs defensive positioning, awareness, reaction)
Rookie