Frosini is nothing special unfortunately, she's not dominant on A2 level, and she'll be 19yo already this year. She can become a solid player, but I wouldn't perceive her as any potential difference maker, with Egonu, Nwakalor, solid players like Mingardi and Piani, and then Antropova, and maybe Enweonwu. She can develop into Piani-like type of player, but with this number of solid opposites, will she be a factor here? I don't think so. Antropova is much better, their stats in A2 are incomparable, and it can't be explained only by the level of their teams, Antropova is scoring like 10 points per game more on better efficiency, and she's even younger.
If you ask about Tokyo, it may be Sorokaite, because of 12-people rosters, her versatility may be very useful, and then IMHO Mingardi, because she got a lot of experience in Busto this year.
In longer perspective of time, it will be one of Antropova and Nwakalor. Mingardi and Piani are okay for a second opposite spot, but Nwakalor is physically suited for a big volleyball while the other two, especially Mingardi, have its limitations. Curve of the development of Nwakalor is also very interesting: she's been pretty average even one year ago, while this season she's been among very best opposites in Serie A. If she continues to grow, she may be even better next year, not to mention her prime. Antropova is even more talented, she's probably among the most talented teenage opposites in the world, she's probably A1 material already while being only 18yo, but until I see a confirmation about her citizenship status, it's only a theory to talk about her in context of Italian NT.
The only position where Italy is lacking a group of really solid talents is defensive/allround OH position: there's Cate who's 27yo and theoretically can play through Paris Olympics, but in fact you have to have some solid substitute for VNL/Euros/alternative for some injury factor (and Bosetti has her history with those) - and I don't think Italy has any, Perinelli is solid, but she's not tested on international level and she got severely injured lately, Populini hasn't been defensive OH when she used to play, Sara Bellia is too young (although I liked her in junior competitions), Gardini is rather offensive OH.
And that might be an Achilles heel of Italy in next years to come, because on other positions they have quality and depth to really dominate in female volleyball: Egonu, awesome middles, good setters and several talented offensive OHs (Pietrini, Sylla, Omoruyi, Gardini) and liberos to replace De Gennaro. But there's only one Cate to fill a spot of more defensive OH.
On the other hand, with Bosetti they can build a dream team without any weakness.
I agree with you about defensive OH position. I had high hopes from Perinelli because her attacking also improved in last two seasons. It is very unfortunate that she got injured. She could definitely play in VNL this summer to get some international experience.
Also L. bosetti is playing as a second libero nowadays. Her contribution at offense is not existent, which wasn't the case before her injury.
I think second Opp should be sorokaite since she can play both oh and opp.
Who do you think will be libero after de gennaro retires?