How to Cite With Inconsistent Use of Initials
You should use the exact information which is provided on the published paper, not the real or current information of the author; even if his name or affiliation1 is change at the present time.  

Moreover, the correct way of citation of each paper is provided in the webpage of its publisher and you can check how they have mentioned the author's name in the citation example (you may also download the bibtex or other outputs to be used in citation manager softwares). At least, by checking the publisher website, you will be sure how they prefer their published paper to be cited (even if other possibilities/doubts for correct citation exists).

1I know that affiliation is not mentioned in citation, but if somebody wants the affiliation of the author at the time of publishing the paper, the best source is the information written on the paper and is provided in its publisher's website.