User blog comment:B214/Volume 22 spoilers/@comment-74.173.162.168-20161030032159/@comment-29963364-20161030035012

Most likely.

1.) Out of the two, Shiva seems to be the only one who actually likes Issei. Not to mention, Mahabali seems to have the utmost respect for Issei (probably respects Shiva more).

2.) Indra has stated to Azazel, in vol.10, that if Issei gets too powerful and Azazel isn't able to "keep him in line", he will personally eliminate Issei. Based on this, I think Indra sees Issei as a potentially powerful subordinate, but his rapidly growing power makes him too unpredictable of a "wild-card." Therefore Indra will likey try to use any method he can to "get rid" of Issei, rather than invite him to his side.