Oh good lord... this better not be about Neck because if it is you're just being obtuse. First half and second half is not small chuncks... one half was clearly not like any other half in his past 5 years...
Camargo actually.
A full season sample is a lot more telling than breaking them up and pointing at the worst part and saying "aha this is who he really was all along." If Camargo had a different minor league profile, people, including me (I think he's a utility man too), would have a totally different outlook on what is going on with him. It would just look like a young player getting better and more powerful
But if you want to talk about Markakis we can do that. It's worth looking at.
Markakis has a career BABIP of .317 and put up .318 BABIP in 2018. Career 109 wRC+ and 114 in 2018.
wRC+ BABIP
Mar/April 137 .304
May 147 .382
June 112 .333
July 126 .315
Aug 81 .277
Sept/Oct 83 .291
First Half (58%) 133 .344
Second Half (42%) 88 .288
Basically what I read is that he was out of his mind in the first half, but three of those constituent months don't reflect any particularly surprising result in BABIP based on career norms.
It is absolutely true that his power and hard hit percentages slumped in the second half as compared to the first half, but it's also true that is relatively expected for players in their mid 30s. It's one reason I'm not as keen sometimes on picking up the aging guy at the deadline. Generally speaking older hitters, as a group, tend to "tire" for lack of a better word as the season goes on.
I'm less inclined to say definitively that Markakis' first half was an unrepeatable aberration. There was very little movement in his peripherals beyond hard hit percentages in second half. He just wasn't hitting the ball as hard, it seems, and he was having worse luck.
It's entirely possible that he was just in good physical health and benefitted from some additional information from the front office. He was hitting the ball in the air more often, striking out less, and hitting the ball harder on average than in 2017.
Sometimes a four month sample is just a matter of body being tuned in with its timing and its gone forever when it is gone. But there is very little data from last year that suggest the difference in his season was pitching adjustments, or getting overpowered. I think he legitimately was run down or perhaps mildly injured (which probably amounts to the same thing in the stats of aging player).
With that in mind, I am marginally ok with bringing him back with a plan to sit him more and perhaps upgrade the position when the trade market clarifies in June. Wasn't my play for the offseason, but it always was a fall back provided you were saving money and years. I think anything more than 1 year of club commitment would be a bad move unless it's like 2/12.