Good questions. Don't forget about the bullpen. Even if everyone elevates their game offensively it won't matter if the bullpen is giving up 7 runs in the 6-7th inning. They should have signed Miller as our closer for the future. 10 million for Nathan, but they couldnt find 10 million for miller?
The whole season is riding on the strength of some old Tommy John arms.
From 2011-2014, 70% of DET's wins have come when they have scored 5 or more runs. In 2014, DET had their best record when scoring 5 runs (62-7, .899 WPCT), yet they scored 5 runs in only 69 games, 11 games fewer than the year before
Average last 4 years = 92 - 70
Last year = 90 - 72
Average Scoring 5 runs or more last 4 years = 64 - 12 .842 WPCT
Last year = 62 -7 .899 WPCT
Average when neither team scores 4 runs or more last 4 years = 28 - 25 .528 WPCT
Last year = 28 - 23 .549 WPCT
From all indications, there is nothing that points to the bull pen losing too many games the last few years. In fact, all of DET's averages are above league average.
Signing ONE guy to the bullpen is not changing the makeup of the bullpen really. Getting someone like Andrew Miller does what? Increase the win total by? At best, it would only be about 1-2 games, given the same conditions. Yet, a solid corner OFer who gets on base could increase the win total by 4-5 games, because the team would be scoring 5 runs or more in more games. So instead, we get 5 players over the last two years with abysmal on base percentages (Kinsler, Davis, Gose, Iglesias and Cespedes).
In 2013, DET scored 5 or more runs in 80 games. In 2014, going with speed and less OBP, it was down to 69 games. Yet, DET did better in 2014 games (51 games) when neither team scored 5 runs over 2013 (53 games). It was the overall pitching keeping the games close.
Starters
2014 = 68-55 (123) 90 QS 69 games 5 or more Run Support
2013 = 76-44 (120) 108 QS 80 games 5 or more Run Support
2012 = 63-51 (114) 90 QS 76 games 5 or more Run Support
2011 = 72-47 (119) 90 QS 78 games 5 or more Run Support
Relievers
2014 = 22-17 (39) 4.35 RA/G 71% SV% 33% IS%
2013 = 17-25 (42) 3.85 RA/G 71% SV% 28% IS%
2012 = 25-23 (48) 4.14 RA/G 71% SV% 31% IS%
2011 = 23-20 (43) 4.39 RA/G 84% SV% 34% IS%