Stead and Larsen still look after Tastle because of what Rahul Dravid said in 2017, I think.
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He was the form bowler for New Zealand A, which included standout figures of 4-22 in a one-day match against India A. His deeds weren't lost on former Indian run-scoring machine Dravid, who labelled it among the best legspin spells he'd seen in Indian conditions.
Astle played with the man famously dubbed 'The Wall' for his staunch technique and ability to bat all day, during a 2009 first-class match for Canterbury.
"It was amazing to hear that. That was nice to have played alongside him and he remembered that, so he obviously knew who I was.
"To bowl that spell and get that type of feedback was great for my confidence going forward at that level. It's something I need to keep trying to replicate whenever I play."
One can imagine the conversations that Stead and Larsen are having about Rachin's bowling with Southee behind the scenes.
"Such a great kid. Respectful, great work ethic, learns so much and performs so well when we give him exposure to a higher level."
"Nah, not totally convinced, eh. Looks a bit fake and ghey as a domestic T20 batter so far, and isn't that supposed to be his big thing? As a spinner I'm told he just lets Michael Bracewell boss him around, never claps back."