"It's good for him, looks like he'll be playing or coming off the bench," said Caskey.
"Good for him, not quite so good for us. But part of our job is providing that stepping stone for the next level."
It means Whanganui start preparing for the upcoming representative campaign without Border's "Holy Trinity" of Tikoisolomone and co-captains Craig Clare and Angus Middleton - the latter unavailable for the representative season while the former is taking a little time off to confirm his presence.
Tikoisolomone came to Border to join older brother and fellow Whanganui rep Renato in 2019 and was sensational in his debut Heartland Championship season – scoring 13 tries in 10 games, just one behind the national record.
Covid-19 meant a short 2020 representative programme, with the speedster also missing some game time with injury, but he finished strong - scoring three tries across the two wins against Wairarapa Bush and Poverty Bay.
In this year's club campaign, Tikoisolomone was nigh-on unstoppable; scoring 23 tries including four hat-tricks across the 12 games in Border's run to back-to-back championships