Blank thru handle question

[tycomps]

Been slowly replacing my older freshwater rods with ones with the split eva foam grips because for me they cast farther, feel lighter, and seem to give me a better 'feel'. I was under the impression that the ones I've been buying have been 'blank thru handle' construction as that's how they appear. One has come loose inside the foam below the reel seat so it appears that it's a separate glued on piece. Is it safe to assume that unless specifically designated 'blank thru handle' the split grip rods are not?