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OPA837: common-mode input range violation

Part Number: OPA837
Other Parts Discussed in Thread: OPA625, TIDA-01055

I was wondering about the common-mode input range of the OPA837 when used as a reference buffer for an ADC.

The TIDA-01055 compares the OPA625 with the OPA837 as a lower power option. In Figure 7 of the Design Guide V1 = 4.1V (similar to Figure 10). But 4.1V at the non-inverting input of the OPA837 violates the common mode input range when powered from a 5V supply. OPA837 datasheet states 3.8V typ. for its high input CM voltage.

1) Why is the OPA837 suggested for this application? (I am considering the OPA837 for a similar application.)

2) What is the meaning of "< 3-dB degradation in CMRR limit" on page 8 of the datasheet concerning the input CM?