A cost analysis for you guys that want the math done for you. These dots should have the same length of life in real life days as far as I know. Note, these numbers assume a full career with full boosts
150 flex GLB2 players (QB / HB / LB) = 150 creation + 1500 SP boosts + 600 career extension + 750 AP boosts = 3000 total cost (900 returned, thus 2100 complete cost)
vs
300 flex GLB1 players (QB / HB / WR) = 300 creation + 9000 boosts + 900 CEQ + 200 Additional CEQ = 10400 total cost (7230 returned, thus 3170 complete cost)
100 flex GLB2 players (WR / TE / FB / CB / FS / SS / DE) = 100 creation + 1200 SP boosts + 600 career extension + 750 AP boosts = 2650 total cost (795 returned, thus 1855 complete cost)
vs
200 flex GLB1 players = 200 creation + 6000 boosts + 900 CEQ + 200 Additional CEQ = 7300 total cost (5030 returned, thus 2370 complete cost)
50 flex GLB2 players (O-line / DT / K / P) = 50 creation + 900 SP boosts + 600 career extension + 750 AP boosts = 2300 total cost (690 returned, thus 1610 complete cost)
vs
100 flex GLB1 players = 100 creation + 3000 boosts + 900 CEQ + 200 Additional CEQ = 4200 total cost (2830 returned, thus 1370 complete cost)
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TL;DR version
Top tier players will cost 1070 LESS in GLB2 (after retirement) and will tie up 7400 LESS in GLB2 prior to retirement
Mid tier players will cost 515 LESS in GLB2 (after retirement) and will tie up 4650 LESS in GLB2 prior to retirement
Lower tier players will cost 240 MORE in GLB2 (after retirement), but will tie up 1900 LESS in GLB prior to retirement