いまさらながら => Still ... now N3
Time
...が ...なら ...も ...だ => ... Anyway... whatever N2
Criticize
ながら(も) => but; although; despite ~. N2
ながらに,ながらの,ながらにして => While A, during the condition A, Since A (point in time) N1
Time, Situation
~ながら、 => While A, B N5
Verb suffixes
しかしながら => however, nevertheless N2
Things do not match the prediction
ながら(も) => Although A, B N2
Contrast,Surprise
が~なら~は~だ => If... is..., then... is... N3
Compare
… とはいいながら => although, even though... N2
Invariant
ながら => while; during; as; to do two things simultaneously. N4
ながらに => while; during; without change; performed in this condition N1
~ながらに      => while; during; without change; performed in this condition N1