Agreed, and of the two, Jana's minutes in the rotation are more secured than Ice's. Both had to play the 5 last year because Geno had no choice. This year Serah can be penciled in for big minutes at the 5, and we don't have to play people out of position.
That means Jana and Ice can be used mostly at their best position, the 5 for Jana, and the 4 for Ice. They may have been overall close in productivity last year but Jana has way more upside. There is no comparison on rebounding and blocked shots. The only reason it was close last year was Jana made far more mistakes, a situation that she should improve substantially this year. Having Serah to go against in practice will help both, but particularly Jana.
If Jana improves even modestly, I doubt if Geno would even consider Ice at the 5. He has a very good starter in Serah, a great option if they go small moving Sarah there, and very good backup in Jana even at last year's level. Ice is probably the 4th best option there and only considered if injuries hit again.
Ice has apparently stayed ahead of Ayanna, her returning challenger for backup 4, but also faces potential threats from above and below. If Jana has a major improvement, Geno could use a three big rotation where Serah could take the backup 4 minutes with Jana at the 5, in a big lineup. In the other direction he could go smaller and use Blanca as the backup 4, in addition to getting significant minutes at the 3.