Why Only Sāriputta Can Memorize Abhidhamma, In His Linguistics, Without Another Blame?

Because, in tipitaka (a.n.), buddha said "only sāriputta know dhammajakka like the buddha" (origin: [187] ‘‘nāhaṃ bhikkhave, aññaṃ ekapuggalampi samanupassāmi yo evaṃ tathāgatena anuttaraṃ dhammacakkaṃ pavattitaṃ sammadeva anuppavatteti yathayidaṃ, bhikkhave, sāriputtoฯ sāriputto, bhikkhave, tathāgatena anuttaraṃ dhammacakkaṃ pavattitaṃ sammadeva anuppavattetī’’tiฯ).

Note: Sāriputta enlighten by buddha, but he fluently in dhamma himself. Because of his powerful wisdom.

In mahāgosiṅgasālasuttaṃ every tipitaka memorizers go to his place to listen him. His words, such as "sahajātapaccaya", also have in parivāra of upāli, too. 

So only his book/pitaka have a difference linguistics from another sutta.