According to a CNBC article by  Amelia Lucas, "Subway sandwich chain sells itself to private equity firm Roark Capital" on Thursday, August 24, 2023. Roark Capital's acquisition of Subway marks the end of the sandwich chain's more than five decades of family ownership and ushers in a new era for the company. Subway had been publicly seeking a buyer since February, with an initial asking price of $10 billion, which reportedly deterred many potential suitors, leaving private equity firms as the primary contenders. While the transaction price was not officially announced, The Wall Street Journal reported that Roark Capital's final bid was approximately $9.6 billion. Roark Capital has a diverse portfolio of more than a dozen restaurant chains, with Subway being the largest in terms of the number of restaurants and annual sales, second only to Dunkin.  Roark Capital's restaurant holdings are organized under different brands and holding companies. Through Inspire Brands, they own Dunkin', Baskin-Robbins, Sonic, Arby's, Buffalo Wild Wings, and Jimmy John's. Under Focus Brands, they own Auntie Anne's, Carvel, Cinnabon, Jamba, McAlister's, Moe's Southwest Grill, and Schlotzsky's. Additionally, Roark Capital invested $200 million in The Cheesecake Factory during the early days of the COVID-19 pandemic to help the struggling chain avoid insolvency.

Question 

1. Name Roark Capital's holding sustainable advantages (valuable, rare, costly to imitate, and non-substitutable) and their corporate diversification strategy. 
2. Name some of Roark capitals holding effective accusation strategy and some problems it could face in its accusation strategy.